$\frac{\left(-1.999\right)^2+\left(-1.999\right)-2}{\left(-1.999\right)+2}$
$5z^2-11z+6$
$\int x\cdot\sqrt{4x+1}dx$
$\left(3m^4-5m^2\right)^3$
$\frac{9}{3x+2}=2+3x$
$\left(5x-4\right)\cdot\left(2x+3\right)-5$
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