$6y^3+y^3$
$\frac{ab\left(x^2+y^2\right)+xy\left(a^2+b^2\right)}{ab\left(x^2-y^2\right)+xy\left(a^2-b^2\right)}$
$\frac{3x^3+6x^2+3x}{3x^2+3x}$
$\lim_{x\to-\infty}\left(\frac{x^3-x}{x^2-6x+5}\right)$
$4\cdot\left(-4\right)+6$
$x\left(4x\:^6+8x^5-12x^3\right)$
$-8+5-3-8x$
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