$\frac{x^2}{4}+4y^2$
$\frac{2x}{x-2}+\frac{6}{x-2}$
$\infty=\infty$
$2c+8c$
$\int x^2\left(x^3+1\right)^{\:3}dx$
$x-31=-42$
$9x^2+6x^2-1$
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