A)4x-7=18
4x=18+7
x=25/4=6.25
B)-5x+4=6x+8
-4=11x
x=-4/11
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4x=18+7
4x=25
x=25/4
b) -5x+4=6x+8
-5x-6x=8-4
-11x=4
-x=4/11 ou x=-4/11
A)4x-7=18
4x=18+7
x=25/4=6.25
B)-5x+4=6x+8
-4=11x
x=-4/11