ecuaciones

A) 24X-7X+8=42-5X
24X-7X+5X=42-8
22X=34
X=34/22

B) 2X+3X+4(5+X)=81-12X
2X+3X+20+4X=81-12X
2X+3X+4X+12X=81-20
21X=61
X=61/21

C) X+2X+3X+4X=5+6X-7(X+1)
X+2X+3X+4X= 5+6X-7X-7
X+2X+3X+4X-6X+7X=-3+5-7
8X=5
X=5/8

D) X-(X+12)=82+4X
X-X-12=82+4X
X-X-4X=82+12
-4X=94
X=94/-4

E) 7X-4=3-7X
7X+7X=3+4
14X=7
X=7/14