Bonjour,
[tex]\frac{x}{7} -2=5\\\\\frac{x}{7} -2+2=5+2\\\\\frac{x}{7} =7\\\\\frac{x}{7}*7=7*7\\\\x=49[/tex]
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[tex]-15x+84=-6\\\\-15x+84-84=-6-84\\\\-15x=-90\\\\\frac{-15x}{15} =\frac{-90}{-15} \\\\x = 6[/tex]
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[tex]-8x-41=7\\\\-8x-41+41=7+41\\\\-8x=48\\\\\frac{-8x}{-8}=\frac{48}{-8} \\\\x = -6[/tex]
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[tex]8x+7=2x-47\\\\8x-2x+7=2x-2x-47\\\\6x+7=-47\\\\6x+7-7=-47-7\\\\6x=-54\\\\\frac{6x}{6}=\frac{-54}{6}\\\\x = -9[/tex]
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[tex]\frac{x}{5}+24=30\\\\\frac{x}{5} +24-24=30-24\\\\\frac{x}{5}=6\\\\\frac{x}{5}*5 =6*5\\\\x=30[/tex]
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[tex]-7x+6=-2x+105\\\\-7x+2x+6=-2x+2x+105\\\\-5x+6=105\\\\-5x+6-6=105-6\\\\-5x=99\\\\\frac{-5x}{-5} =\frac{99}{-5}\\\\x = 19,8[/tex]
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[tex]-6x-18=3x+90\\\\-6x-3x-18=3x-3x+90\\\\-9x-18=90\\\\-9x-18+18=90+18\\\\-9x=108\\\\\frac{-9x}{-9}=\frac{108}{-9}\\\\x = -12[/tex]
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[tex]-3x+76=x+20\\\\-3x-x+76=x-x+20\\\\-4x+76=20\\\\-4x+76-76=20-76\\\\-4x=-56\\\\\frac{-4x}{-4}=\frac{-56}{-4}\\\\x=14[/tex]
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[tex]5x-88=-2x+45\\\\5x+2x-88=-2x+2x+45\\\\7x-88=45\\\\7x-88+88=45+88\\\\7x=133\\\\\frac{7x}{7} =\frac{133}{7}\\\\x =19[/tex]
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[tex]6x+15=x+80\\\\6x-x+15=x-x+80\\\\5x+15=80\\\\5x+15-15=80-15\\\\5x=65\\\\\frac{5x}{5}=\frac{65}{5} \\\\x=13[/tex]
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[tex]7x+65=-5\\\\7x+65-65=-5-65\\\\7x=-70\\\\\frac{7x}{7} =\frac{-70}{7}\\\\x=-10[/tex]
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[tex]18x+48=7x-106\\\\18x-7x+48=7x-7x-106\\\\11x+48=-106\\\\11x+48-48=-106-48\\\\11x=-154\\\\\frac{11x}{11}=\frac{-154}{11}\\\\x=-14[/tex]
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J’espère t’avoir aidé ^^
Bonne journée et bonne continuation.
