$$108 = 7x-25$$
Answer
$$ x = 19 $$
Explanation
$$ \begin{aligned} 108 &= 7x-25&& \text{ swap the left and right side of the equation } \\[1 em]7x-25 &= 108&& \text{ move -25 to the right } \\[1 em]7x &= 108+25&& \\[1 em]7x &= 133&& \text{ divide both sides by $ 7 $ } \\[1 em]x &= \frac{133}{7}&& \\[1 em]x &= 19&& \\[1 em] \end{aligned} $$
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