$4x-2=-4x+6$
$2x+6x+14x$
$dx+\left(y^4+x^2y^4\right)dy=0$
$\frac{4x-2}{x\left(x-1\right)\left(x+2\right)}$
$\frac{x^2+6x+9}{x-3}$
$\left(x^2-1\right)-\left(x^2-7\right)$
$\frac{x^{-1}+y^{-1}}{z^{-1}}$
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