$9a^5-12a^3+15a^2-24ab^3$
$4x-9+7x+4$
$3x^2-2x-7$
$\int\left(\frac{3z}{\sqrt[3]{z^2+1}}\right)dx$
$2-3+4+1-8+2$
$-5-1\left(+1\right)-1+6-\left(-3\right)$
$\frac{7^8}{7^3}$
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