Question
$$6x+3x = -16+5x$$
Answer
$$ x = -4 $$
Explanation
$$ \begin{aligned} 6x+3x &= -16+5x&& \text{simplify left and right hand side} \\[1 em]9x &= 5x-16&& \text{move the $ \color{blue}{ 5x } $ to the left side} \\[1 em]9x-5x &= -16&& \text{simplify left side} \\[1 em]4x &= -16&& \text{ divide both sides by $ 4 $ } \\[1 em]x &= -\frac{16}{4}&& \\[1 em]x &= -4&& \\[1 em] \end{aligned} $$
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