$\lim_{x\to3}\left(\frac{x^3-26}{x-3}\right)$
$\left(5x-3\right)\left(2x+1\right)$
$x=8;\:y=6$
$\left(18+23-7\right)\cdot5$
$\left(2a+5m\right)\left(m^2n-n\right)$
$-45x-45=-75x+75$
$\frac{2}{1+\cot^2\left(x\right)}=\tan\left(x\right)\sin\left(x\right)$
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