$\frac{-1}{2}ab+\frac{2}{3}ab^2$
$n2\:+\:40n\:+\:3$
$\frac{2z^4+3z^3-z+1}{z^2-3z+2}$
$3x+2=26$
$\left(\sqrt{x}\right)^9$
$4y-3=3\left(3y+4\right)$
$3x\cdot\left(-2x\right)\cdot4x$
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