$5\sqrt{98}-3\sqrt{18}$
$\left(w+7\right)\left(w-4\right)$
$\frac{2^{n+4\:}-2.2^{n+2}}{2.2^{n+3}}$
$12-8-7+5-1$
$3+-3+-9+3+-3$
$\int\left(\frac{1}{x}\left(ln\left(x\right)+x\right)\right)dx$
$50-40+87-30$
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