Question

$3x + 7 = \frac{1}{729}$
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Answer 1

$3x + 7 = \frac{1}{729} \\\\3x = \frac{1}{729} - 7\\\\3x = \frac{1-5103}{729}\\\\3x = \frac{-5102}{729}\\\\x = \frac{-5102}{2187}$

Espero ter ajudado.