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2x + 12 - 7x = 3x - 5x + 8
2x - 7x + 12 = 3x - 5x + 8
- 5x + 12 = - 2x + 8
- 5x + 2x = 8 - 12
- 3x = - 4
x = -4/-3
x = 4/3
Solución :
x = 4/3
2x-7x-3x+5x=8-12=
-10x+2x=-4
-8x=-4
-8\-4=2