$25m^2-225$
$9x^2-30x-25$
$20xy^2-5xy+10x^2y-5x^2y^2$
$-3x\:+\:6\:=\:-9$
$\left(n^3+0.5\right)^2$
$\frac{-\csc^2\left(x\right)-1}{1-\cos^2\left(x\right)}$
$5s\:-\:7\:+\:t\:-\:t$
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