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(8x-w)+[-10x-5w+20w+50x]
8x-w-10x-5w+20w+50x
8x-10x+50x-5w+20w-w
32x+14w sumando X y Z da esa respuesta.
8x-w + [-10x-5w+20w+50x]
8x-w + [+40x+15w]
8x-w +40x +15w
48x -14w