$\left(x^2+2x\right)y'=x^2y$
$-20a+15b;a=-3b=5$
$x\:=\:\log_{1.05}$
$x^3-3^2-2x+1$
$25+26m^2+9m^2$
$\lim_{x\to0}\left(\frac{1-\cos\left(2x\right)}{\sin\left(x\right)\cdot\cot\left(x\right)}\right)$
$-\left(-30\right)+\left(-50\right)-\left(+20\right)+\left(+10\right)$
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