$\left(4y\:-\:6\right)\:-\left(6y\:-\:10\right)$
$\frac{4x^2-12x+5}{x-1}$
$\left(9m+8\right)\left(9m-8\right)$
$\left(3x^3-2y\right)-\left(5y-2x^3+5\right)+\left(4+7y\right)$
$2x-4y+6$
$-3cd+5cd-5cd$
$15x^2+30x-45$
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