Bonjour,
a)
[tex]4x+7=2x+13\\4x+7-7=2x+13-7\\4x=2x+6\\4x-2x=2x-2x+6\\2x=6\\\frac{2x}{2} =\frac{6}{2}\\ x=3[/tex]
b)
[tex]x-2=10+5x\\x-2+2=10+2+5x\\x=12+5x\\x-5x=12+5x-5x\\-4x=12\\4x=-12\\\frac{4x}{4} =\frac{-12}{4} \\x=-3[/tex]
c)
[tex]-3x-8=-7x-4\\-3x-8+8=-7x-4+8\\-3x=-7x+4\\-3x+7x=-7x+7x+4\\4x=4\\\frac{4x}{4} =\frac{4}{4} \\x=1[/tex]
d)
[tex]2t+5=5t+12\\2t+5-5=5t+12-5\\2t=5t+7\\2t-5t=5t-5t+7\\-3t=7\\3t=-7\\\frac{3t}{3} =\frac{-7}{3} \\x=-\frac{7}{3}[/tex]
Bonne journée et surtout, prends bien soin de toi ;)
