$\left(-6\right)\cdot\left(-6\right)$
$4-7-8-9-3+18$
$\left(4x-5\right)\left(4x-9\right)$
$\left(2a\right)\left(x+3\right)$
$4\frac{dy}{dt}-4y=-8$
$\left(x+5y\right)\left(x+2y\right)$
$2x^2-9x-1$
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