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Separa los terminos
12x + 7 - 4x = 12x + 17
12x - 12x - 4x = 17 - 7
Elimina 12x - 12x y resta 17 - 7
-4x = 10
(-1) -4x = 10
4x = -10
x = -10 / 4
x = -5 / 2
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