Question
$$11x+3 = 15x+3$$
Answer
$$ x = 0 $$
Explanation
$$ \begin{aligned} 11x+3 &= 15x+3&& \text{move the $ \color{blue}{ 15x } $ to the left side and $ \color{blue}{ 3 }$ to the right} \\[1 em]11x-15x &= 3-3&& \text{simplify left and right hand side} \\[1 em]-4x &= 0&& \text{ divide both sides by $ -4 $ } \\[1 em]x &= \frac{0}{-4}&& \\[1 em]x &= 0&& \\[1 em] \end{aligned} $$
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