Respuesta :
Answer:
A.
7x-3=4x+3
7x-4x=3+3
3x=6
x=6/3
x=2
B.
6(-2-z)=-5(2x+4)
-12-6z=-10x - 20
10x=12+6z-20
10x= -8+6z
x=(-8+6z)/10
Since the 2nd one is equation in 2 variables there isn't a specific answer to it I just simplified it and solved for x
Hope it helps