Bonjour,
a. 2x-8=10 <=> 2x-8+8=10+8 <=> 2x=18 <=> x=9
b. 0=5x+10 <=> 0=5x-5x+10 <=> -5x=10 <=> x=-2
c. 4x-5=2x+3 <=> 4x-5+5-2x=2x-2x+3+5 <=> 2x=8 <=> x=4
d. 3-4x=7x+1 <=> 3-3-4x-7x=7x-7x+1-3 <=> -11x=-2 <=> x=[tex]\frac{2}{11}[/tex]
e. 2x-5=-3x+10 <=> 2x-5+5+3x=-3x+3x+10+5 <=> 5x=15 <=> x=3
f. x-1=-3x-2 <=> x-1+1+3x=-3x+3x-2+1 <=> 4x=-1 <=> x=[tex]\frac{-1}{4}[/tex]
g. [tex]\frac{x}{5}=\frac{3}{4}[/tex] <=> [tex]\frac{xX5}{5} = \frac{3}{4}X5[/tex] <=> x= [tex]\frac{15}{4}[/tex]
h. [tex]\frac{-3}{7}=\frac{-x}{-35}[/tex] <=> [tex]\frac{-3}{7} X(-35) = \frac{-xX(-35)}{-35}[/tex] <=> -x= 15 <=> x=15
Voilà, j'espère t'avoir aidé.
