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PERO EL ORDEN DE LOS FACTORES NO ALTERA EL PRODUCTO
3X+10 = 4X -10
10 +10 = 4X -3X
20 = X
BCA = 20
3x+10 = 4x-10
20 = x
reemplazas
I) 3(20)+10 = 70
II) 4(20)-10 = 70
⇒ BCA es 70