$81m^2-121n^2$
$879.29\cdot1.72$
$x+1-1-\left(x-2\right)$
$\int\frac{1}{\sqrt{1-x^2}.x^4}dx$
$\left(2x^2+8x-3\right)\cdot\left(x^2-9x+4\right)$
$-13+x=-19$
$-4\left(u+3\right)-3u=2\left(u+3\right)$
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