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90-x+90-3x=90-5x
180-4x = 90-5x
-4x +5x = 90-180
X = -90
Ninguna de tus alternativas
Comprobación:
90-(-90)+90-3(-90)= 90-5(-90)
90+90+90+270 = 90+450
270+270 = 540
540 = 540
La solución es -90