Question

X+7=3(x-1) valor de la variable

Answer 1

X+7=3(x-1)
x+7=3x-3
10=2x
x=5

Answer 2

x + 7 = 3 (x - 1)

x + 7 = 3x - 3

x - 3x = - 3 - 7

- 2x = - 10

x = -10/-2

x = 5

Solución : 

x = 5