$\frac{a^3-27b^3}{3a-9b}$
$-24+-35+20+-22$
$\left(-11\right)-\left(-20\right)$
$y=3x^2+9x;\:x=-9$
$\left(\frac{4x^2}{3}-8=20\right)$
$\left(-50\right)^4$
$\frac{3}{4}+\frac{1}{4x}$
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