$12-4n$
$\frac{2a^2-a-15}{2a+5}$
$\int2x\sqrt[5]{64+x^2}dx$
$\cos^2\:u\:+\:4\sin\:u\:-\:4\:=\:0$
$\frac{3x^2-11x-13}{3x+4}$
$\frac{y^2+3y-11}{y+5}$
$35+\left(9\left(3+\left(2+7\right)\right)\right)$
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