$$-6x-4 = 3-7x$$
Answer
$$ x = 7 $$
Explanation
$$ \begin{aligned} -6x-4 &= 3-7x&& \text{move the $ \color{blue}{ -7x } $ to the left side and $ \color{blue}{ -4 }$ to the right} \\[1 em]-6x+7x &= 3+4&& \text{simplify left and right hand side} \\[1 em]x &= 7&& \\[1 em]x &= 7&& \\[1 em] \end{aligned} $$
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