$\frac{3x-2\:}{2x+1}+\frac{x-1}{2x+1}$
$\left(a+3b\right)^4-22\left(a+3b\right)^2+121$
$\int\frac{1}{\left(a^2-x^2\right)^3}dx$
$\frac{-4x^4+0x^3+3x^2-1}{4x^2-1}$
$x^3-19x-30$
$2x^4+x^3-8x^2-x-6$
$x^2-15x+50=0$
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