$-3x+13=2x+8$
$\frac{1}{2x^2+9x-5}$
$2\left(x+2x\right)^2+2$
$\int\:\left(x^2+1\right)^4dx$
$\frac{x^3-3x^2+6x+1}{3x+21}$
$30x^2y^3-10xy^2+20x^2y$
$13r+5s-2r$
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