Question
$$30(x+15)+40(x+25) = 25$$
Answer
$$ x = -\dfrac{285}{14} $$
Explanation
$$ \begin{aligned} 30(x+15)+40(x+25) &= 25&& \text{simplify left side} \\[1 em]30x+450+40x+1000 &= 25&& \\[1 em]70x+1450 &= 25&& \text{ move 1450 to the right } \\[1 em]70x &= 25-1450&& \\[1 em]70x &= -1425&& \text{ divide both sides by $ 70 $ } \\[1 em]x &= -\frac{1425}{70}&& \\[1 em]x &= -\frac{285}{14}&& \\[1 em] \end{aligned} $$
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