Question
$$250-50x\cdot3+50 = 0$$
Answer
$$ x = 2 $$
Explanation
$$ \begin{aligned} 250-50x\cdot3+50 &= 0&& \text{simplify left side} \\[1 em]250-150x+50 &= 0&& \\[1 em]-150x+300 &= 0&& \text{ move the constants to the right } \\[1 em]-150x &= -300&& \text{ divide both sides by $ -150 $ } \\[1 em]x &= \frac{-300}{-150}&& \\[1 em]x &= 2&& \\[1 em] \end{aligned} $$
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