$\frac{\left(x+2\right)}{\left(x+7\right)\left(x-9\right)}$
$\frac{3x^3-x^2+2}{x+2}$
$\left(x^3-20\right)\left(x^3-12\right)$
$\frac{4x^2-16}{x^2-2x}$
$\:-6.\left(x\right)=-\:18$
$x^2-4x-5y+9=0$
$12=2x^2-2x$
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