$4x+81+x^2$
$\left(6x^2xy+2\right)+\:\left(2z-xy+4\right)$
$\left(2a-3x\right)^3$
$y^2-1+2y^2$
$9x^2+36x+9$
$\frac{\left(\frac{1}{6}\right)}{1-\left(-x\right)}$
$\frac{9}{16}m^2+\frac{30}{4}m+25$
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