$x^2y+2xy=3x^2$
$3x\:+\:2x\:-\:5\:+\:6\:-\:7x$
$3x^2+5x-12$
$3x-2y+4x+y$
$\frac{-3}{x^3-1}$
$8=x+2$
$64y^6-x^3$
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