$x\frac{dy}{dx}+2y=-1e^x$
$-3\left(8-5x\right)$
$\int\frac{2x+21}{x^2+3x-10}\:dx$
$3.1\cdot24+12$
$\left\{\left(-2\right)-\left(-1\right)+\left[\left(+4\right).\left(-1\right)\right]\right\}$
$27a^3-64$
$\int3\left(3x-7\right)^4dx$
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