Question
$$\frac{x}{5} = 5+4+3+2+1$$
Answer
$$ x = 75 $$
Explanation
$$ \begin{aligned} \frac{x}{5} &= 5+4+3+2+1&& \text{multiply ALL terms by } \color{blue}{ 5 }. \\[1 em]5 \cdot \frac{x}{5} &= 5\cdot5+5\cdot4+5\cdot3+5\cdot2+5\cdot1&& \text{cancel out the denominators} \\[1 em]x &= 25+20+15+10+5&& \text{simplify right side} \\[1 em]x &= 75&& \\[1 em]x &= 75&& \\[1 em] \end{aligned} $$
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