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-4(x)-4(-3)=8-5(x)-5(-1)
-4x+12 = 8-5x+5
-4x+5x = 8+5-12
x = 1
COMPROBACIÓN:
-4(1) + 12 = 8 - 5(1) + 5
-4 + 12 = 8 -5 + 5
8 = 8
si te ayudó dale mejor respuesta y un gracias ..... :)suerte