$$12x-4+3x+5 = 6$$
Answer
$$ x = \frac{1}{3} $$
Explanation
$$ \begin{aligned} 12x-4+3x+5 &= 6&& \text{simplify left side} \\[1 em]15x+1 &= 6&& \text{ move 1 to the right } \\[1 em]15x &= 6-1&& \\[1 em]15x &= 5&& \text{ divide both sides by $ 15 $ } \\[1 em]x &= \frac{5}{15}&& \\[1 em]x &= \frac{1}{3}&& \\[1 em] \end{aligned} $$
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