2x + 9 = 3 ( x + 1 )
2x + 9 = 3x + 3
x = 9 + 3
x = 12
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Explicación paso a paso:
2x + 9 = 3 ( x + 1 )
2x + 9 = 3x + 3
x = 9 + 3
x = 12