$20^4\cdot20^{-2}$
$32^2\cdot7$
$-37=45+r$
$\frac{-6\cdot2-10}{-11}$
$\int\frac{5}{2x^2-2x}dx$
$\lim_{x\to10}\left(2x\cdot logx^3\right)$
$10x+5=9x+6$
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