$49n^2-56n+16$
$-7a-3b+4b-2a$
$-\int\left(2\right)dx$
$\int\left(1+x\right)^2\sqrt[3]{x}dx$
$\int15^{2x}dx$
$\lim_{x\to3}\left(\frac{x-\sin\left(x-3\right)-3}{x-3}\right)$
$-7y^3-3y+5y-y^3-4+7y^{3\:}-7y$
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