$\frac{x-3}{5-x}+5\frac{2x+3}{x-2}$
$-85+1-6+7-9$
$x^4-x^3-11x^2+9x+18$
$\frac{3x^4+7x^3+11x-11}{x}$
$m^2+4mn+4m^2$
$\int\left(\frac{\sqrt{81-x^2}}{9x^2}\right)dx$
$\left(4u^3-3v^2\right)^2$
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