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(3x+2x) + (-5+3) = -12
5x-2 = - 12 juntamos los términos comunes------
5x = -12 +2 observa que al pasar al otro lado se cambia de signo---
5x = - 10----
x = - 10 / 5 dividimos--
x = -2 ----
b) 8+4x -12 = 7x + 11--
8 - 12 - 11 = 7x - 4x---
- 15 = 3x--
-5 = x--
c) 6x-15-2x = 10+9x--
-15 -10 = 9x + 2x - 6x--
- 25 = 5x--
- 25/5 = x--
- 5 = x------
d) 32 - 12x -12 = -4 -6x -----
32 - 12 + 4 = -6x + 12x---
24 = 6x---
24/6 = x--
4 = x