$\left(-17\right)+\left(+5\right)-\left(-20\right)$
$f\left(x\right)=-3.e^{x+1}$
$7v\:+\:2v\:+\:4v\:+\:x$
$-49+7\cdot\left(-5\right)$
$\int\left(2x+1\right)^2dx$
$x^2+36x+1$
$23\cdot10^2$
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