Explicación paso a paso:
3x + 7 = 5x - 9
3(8) + 7 = 5(8) - 9
24 + 7 = 40 - 9
31 = 31
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Explicación paso a paso:
3x + 7 = 5x - 9
3(8) + 7 = 5(8) - 9
24 + 7 = 40 - 9
31 = 31