$9\left(-1\right)^2+12\left(-1\right)+6$
$\left(3y-4\right)\left(2y+7\right)$
$\left(x-\frac{2}{5}y\right)\left(\frac{5}{6}y+\frac{1}{3}x\right)$
$\left(-17a^9b^{12}\right)\left(-2c^3b\right)\left(-10a^5b^2c^{11}\right)$
$x^4-20x^2+64$
$\left(a+5b\right)\left(a+3b\right)$
$2x^2=2$
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