$\left(5a-8b\right)\left(3a+4b\right)$
$\frac{5x^3y}{10x^3y^3}$
$0.1x^2-0.6x+5$
$\left(4d+5\right)\left(4d-5\right)$
$xy-xy$
$\frac{x^2-3x}{x-2}$
$2y+15=4y-45$
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