$x^2y^2-x^2y+xy$
$5\sqrt{54}$
$a^2-4-4$
$63\:x\:\left(-6\right)-\:83\:+\:\left(-31\right)-\:\left(-42\right)$
$\left(x^2+2xh+h^2-8\right)^2$
$5x-\frac{1}{3}<\frac{1}{2}$
$\left(10.2x+1.2a\right)^2$
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