Question

no entiendo me pasan esto: -3*(1-x) +12=5*(x+3)-4

Answer 1

- 3 (1 - x) + 12 = 5 (x + 3) - 4

- 3 + 3x + 12 = 5x + 15 - 4

9 + 3x = 5x + 11

3x - 5x = 11 - 9

- 2x = 2

x = 2/-2

x = - 1

Solución : 

x = - 1