$19x-57+9y-9-z+30$
$2\left(3x+4\right)-3\left(9-2x\right)<2\left(x-1\right)-3\left(5-2x\right)$
$\int\frac{e^{\frac{2}{5}x}.\:\frac{1}{5}e^{-\frac{1}{5}x}}{-1\:xe^{-\frac{2}{5}x}}dx$
$\left(2y+2x\right)\left(2y-3x\right)$
$810\:.\:90$
$3-3^2-2-3+4+4^2+5$
$12\:\::-3$
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