$\int5x+8\left(x+2\right)\left(x-1\right)dx$
$\frac{2x^4-4x^2+7x+3}{x+3}$
$x+4x-21$
$\int_{\frac{y}{2}}^{a-\frac{y}{2}}\left(k\right)dy$
$ax+bx+cx$
$\lim_{x\to0}\left(\frac{e^{x^2}-1}{x\cdot2-x}\right)$
$-a+2b;\:a=1;\:b=-2$
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