$$x+40x+60x = 100$$
Answer
$$ x = \frac{100}{101} $$
Explanation
$$ \begin{aligned} x+40x+60x &= 100&& \text{simplify left side} \\[1 em]101x &= 100&& \text{ divide both sides by $ 101 $ } \\[1 em]x &= \frac{100}{101}&& \\[1 em] \end{aligned} $$
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