$$ \begin{aligned} 7x+4 &= 4-3x&& \text{move the $ \color{blue}{ -3x } $ to the left side and $ \color{blue}{ 4 }$ to the right} \\[1 em]7x+3x &= 4-4&& \text{simplify left and right hand side} \\[1 em]10x &= 0&& \text{ divide both sides by $ 10 $ } \\[1 em]x &= \frac{0}{10}&& \\[1 em]x &= 0&& \\[1 em] \end{aligned} $$
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