$$25x\cdot4+75-10 = 0$$
Answer
$$ x = -\frac{13}{20} $$
Explanation
$$ \begin{aligned} 25x\cdot4+75-10 &= 0&& \text{simplify left side} \\[1 em]100x+75-10 &= 0&& \\[1 em]100x+65 &= 0&& \text{ move the constants to the right } \\[1 em]100x &= -65&& \text{ divide both sides by $ 100 $ } \\[1 em]x &= -\frac{65}{100}&& \\[1 em]x &= -\frac{13}{20}&& \\[1 em] \end{aligned} $$
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