$\int\frac{5x+2}{\left(x^3-x^2-2x\right)}dx$
$\frac{4x^3+16x^2+x+11}{x+4}$
$\left(\sqrt{7}-\sqrt{5}\right)\left(\sqrt{5}+\sqrt{7}\right)$
$x^2-2x-15=22$
$9ab+3b^{2}-7b^{2}+8ab-12$
$21c-8c$
$-4\left(5x+2\right)+2x+4=50$
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