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2(x+y) = 12
2 (6) = 12
12 = 12
x + y = 6
2x + 2y = 12
Solución = x + y = 6
2x + 2y = 12
2 (x + y) = 12
2 (6) = 12 ⇒ Multiplicas el 2 por el 6
12 = 12