$14xy-xy-6+9x+8-5xy$
$\left(4a-3b^2\right)^3$
$y^2-x^2=9$
$\frac{6x^3-3x^2-21x-11}{3x+3}$
$\left(45-m\right)^2$
$-189\:_{\:-21}$
$\sqrt[4]{\left(3x^5y^{-2}\right)^4}$
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