$\left(5xy-3y\right)^2$
$\int_3^{\infty}\left(\frac{sin\left(\frac{\pi}{x}\right)}{x^2}\right)dx$
$a^4+b^4-a^2-b^2+2ab\left(ab-1\right)$
$\left(275-2x\right)\left(200-2x\right)x$
$3c+c$
$\sqrt{5}\sqrt{2x+5}$
$\frac{7-x}{8-x}-x+8=\frac{x-7}{x-8}$
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