$\frac{t^4-81}{t+3}$
$\left(-x^7y^{\frac{1}{2}}-4a^4b^4\right)^4$
$\frac{2-2x}{x-3}\ge2$
$3x-7+4x+15$
$xy'=x^3-2y$
$0\frac{5}{2}$
$\frac{1}{4}x^6+y^{-6}$
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