Question
$$12b+16 = 4+6b$$
Answer
$$ b = -2 $$
Explanation
$$ \begin{aligned} 12b+16 &= 4+6b&& \text{move the $ \color{blue}{ 6b } $ to the left side and $ \color{blue}{ 16 }$ to the right} \\[1 em]12b-6b &= 4-16&& \text{simplify left and right hand side} \\[1 em]6b &= -12&& \text{ divide both sides by $ 6 $ } \\[1 em]b &= -\frac{12}{6}&& \\[1 em]b &= -2&& \\[1 em] \end{aligned} $$
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