Question
$$2x+4\cdot(35-x) = 94$$
Answer
$$ x = 23 $$
Explanation
$$ \begin{aligned} 2x+4\cdot(35-x) &= 94&& \text{simplify left side} \\[1 em]2x+140-4x &= 94&& \\[1 em]-2x+140 &= 94&& \text{ move 140 to the right } \\[1 em]-2x &= 94-140&& \\[1 em]-2x &= -46&& \text{ divide both sides by $ -2 $ } \\[1 em]x &= \frac{-46}{-2}&& \\[1 em]x &= 23&& \\[1 em] \end{aligned} $$
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