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12x + {2x - (2x - x - 10)} = 4 + 5x - 6
12x + {x + 10} = 5x - 2
12x + x + 10 = 5x - 2
13x + 10 = 5x - 2
13x - 5x = - 2 - 10
8x = - 12
x = -12/8
x = -3/2
Solución :
x = -3/2