Explicación paso a paso:
X+2 + X+3 + X+4 + X + X + X + X+2 + X+3 + X+4 + 3X = 12X + 18
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Explicación paso a paso:
X+2 + X+3 + X+4 + X + X + X + X+2 + X+3 + X+4 + 3X = 12X + 18