$\left(8+x\right)\left(15-3a\right)$
$5x^2-25x+8$
$\frac{a+7}{3}=5$
$t-\frac{1}{t+1}$
$-\left(-30\right)+\left(-50\right)-\left(+20\right)+\left(+10\right)$
$687,6\:.\:10$
$\int\frac{\left(4x\right)}{\left(x+2\right)\left(x^2-1\right)}dx$
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