$z^2-30z+17=0$
$4\left(1-5\right)-\left(4-5\right)$
$5y^3-10y+30$
$25x^2-20x+4x$
$\lim_{x\to\infty}\left(e^{-\frac{\left(x+1\right)}{x^2+2}}\right)$
$-2\left(5\:-\:2x\right)\:+\:2\left(5x\:-\:1\right)$
$\log\left(\frac{2\left(x+7\right)^5}{\sqrt[3]{x^4}}\right)$
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