Resposta:
x/3 + 4x = 39
x + 4x . 3 = 39 . 3
x + 12x = 117
13x = 117
x = 117/13
x = 9
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Resposta:
x/3 + 4x = 39
x + 4x . 3 = 39 . 3
x + 12x = 117
13x = 117
x = 117/13
x = 9