$5n-2n^2-15m+6mn$
$\lim_{x\to0}\left(\frac{sin\:\left(x\right)\:-x\:}{x^2}\right)$
$3\sqrt{x}+38=41$
$3x-2xy;\:x=-1;\:y=2$
$\left(x+\frac{2}{x}\right)\left(x^2-2+\frac{4}{x^2}\right)$
$-6xy+25y^2$
$\left(a+5b+3c\right)^2$
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