$a^4-a^7$
$\frac{a^2}{25}-\frac{ab}{6}-\frac{b^2}{5}$
$4\left(1+a\right)^2-4\left(1+a\right)+1$
$-5\left(2y+3\right)$
$\frac{125a^3+8b^3}{5a+8b}$
$6a^2-5a^2+10a^2$
$\frac{y-1}{x}\cdot\frac{dy}{dx}=5$
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