$13x\:-\:5\:=\:-5\:+\:13x$
$2x^2+9xy+5xy-7x^2$
$7-6\left(1-6n\right)$
$3x^2-18x-20$
$\int\frac{x-1}{x^{\frac{1}{3}}-1}dx$
$2n-2m$
$\left(\frac{1}{2}y^2-x\right)^2$
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