$x^2+bx-\frac{b^2}{4}$
$\left(3d^3ef^4\right)^4$
$5\left(x+1\right)+6\left(x+2\right)=7\left(x+3\right)$
$7x^2-24x+18$
$\left(2x^2\right)+\left(-3\right)^2+\left(-x\right)^2$
$3a^2b^2+9a^3b$
$\left(x^2-3x\right)\left(4x^2+2x-9\right)$
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