$\:\left(x+4\right)\left(x-2\right)$
$-20\:\cdot\:-2\:-\:10$
$b^2-18b+81$
$-25a^2+20ab+4b^2$
$\frac{1}{2}x-\frac{1}{2}\le\frac{3}{4}x+\frac{7}{6}$
$45g^3+34g^2+g-1+12g^5+27g^4+76g+45$
$\left(3x+30\right)\left(3x-30\right)$
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