$\frac{x^7+x^3+140}{x-2}$
$x^2-15x$
$\int\frac{2x-7}{x^2+2x-4}dx$
$\left(-3\right)x\left(-8\right)=\left(-8\right)x\left(-3\right)$
$\frac{225}{81}m^2$
$\frac{4a^4b^3}{-12a^2b}$
$x^2+4x=1$
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