$325-721+321-520$
$a-5+5$
$\left(3x^2-5yx\right)$
$2\cdot2^{-1}+3\cdot5^{-2}$
$-4\cdot5-\left(5\right)^2$
$\left(3^{2}\right)^{4}$
$\int\frac{3-4x}{x^2-3x+2}dx$
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