$5z+2+13z-7$
$\frac{4}{s^3+4s}$
$-5x^2>-5$
$7\cdot2+1-5$
$\int\frac{1}{\left(x+2\right)^3\left(x^2+1\right)}dx$
$12.1\cdot1.2$
$\left(x^2-3\right)\left(x^2-9\right)$
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