$\frac{x^3-1}{x^2+1}$
$18y-30$
$48x^5-12z^4x^2+6zx^4$
$logx\:=\:4log5$
$\frac{2xy}{yx}$
$\frac{8x^{2}-5x+1}{2x^{2}+2}$
$\left(3y\:-\:7\:y^3\right)^2$
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