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5X + 7 = 12
5X = 12 - 7
5X = 5
X = 5 ÷ 5
X = 1
comprobamos:
5X + 7 = 12
5(1) + 7 = 12
5 + 7 = 12
12 = 12
RESPUESTA:
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EL NUMERO ES 1