$6x+1+7x$
$-6x^5y^5\left(11x^5\right)$
$x+9=3x+21$
$5a^2\:-\:3a\:-\:2$
$3x+5\left(x+1\right)$
$2sin^2x=0$
$\frac{\left(2x^3y^3+x^2y-3xy^2\right)}{\frac{1}{5}xy}$
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