$3ab+2ac+18ad+2ac+18ac+3ad+18ab+2ac$
$x^2+2xf+f^2$
$\left(5x-2\right)\cdot\left(x^3-4x^2+2x-1\right)$
$-8\cdot4+9$
$x^2+9x+18\le0$
$\sqrt{2x-1}=1$
$1\left(y\right)+1\left(x\right)$
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