Explicación paso a paso:
5x + x = 3x + 15
6x = 3x + 15
6x - 3x = 15
3x = 15
x = 15/3
x = 5
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Explicación paso a paso:
5x + x = 3x + 15
6x = 3x + 15
6x - 3x = 15
3x = 15
x = 15/3
x = 5