$x^2+bx+\frac{b}{4}^2$
$\frac{6x-3}{x+2}\le5$
$3x^2=5+2x$
$\left|21\cdot2\right|\cdot9$
$\left(1+x\right)\left(1-x\right)-\left(1-x\right)$
$4x^2+x-18$
$\left(4ab\right)^{\:2}$
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