$\left(\frac{x^5y^2}{x^3y^4}\right)^3$
$\frac{4x^2-8x^2}{2x}$
$\left(3a+1\right)\left(3a+-1\right)$
$x^2+9x-15$
$20-15mas\:45$
$218\:-654$
$84+15$
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