$\frac{-2x^4+3x^3+6x^2-5}{x-2}$
$-x^2-36$
$\frac{6}{7}+y\ge6$
$2y-2yx-3y^2=0$
$m^2+30+90$
$x^2+3x-5=y$
$\left(6-9+7-11\right)-\left(8-10+13-16\right)$
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