$3+8b+7-3b+9$
$\left(\frac{x^2}{2}+\frac{3x}{4}\right)+\left(\frac{5x^2}{3}+\frac{x}{2}\right)$
$\left(-4x+1\right)^2$
$\left(2+2t\right)^2$
$3x^2-3x+1$
$\left(2a^{x-1}+3b^{y-2}\right)^2$
$4\left(1+m\right)\left(n-1\right)$
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