$\frac{x^2-49}{x-7}$
$\frac{-10}{u}=2$
$5+\frac{2x}{x-3}=\frac{6}{x-3}$
$\left(x-5\right)\left(x+5\right)+\left(x-1\right)\left(x+1\right)$
$5s+-8s+-7s+-10s$
$-y^2+25y^2-1-2x$
$20-624$
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