$4\left(n+9\right)-3\left(2+n\right)$
$\left(4x^6-10y^5-5y^4\right)\left(-2x^3\right)$
$\frac{4y^2+20y+25}{2y^3+3y^2-5y}$
$\left(6-7n\right)^2$
$\frac{0}{x^{2}}$
$\left(2x+2\right)^2$
$\left(2b-3\right)\left(2b+3\right)$
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