$\frac{4x^3-2x^2}{2x}$
$\left(64x^2-18y\right)$
$7x<40$
$4^{\left(-1\right)^2}$
$-3\sqrt{28}-\sqrt{63}$
$-\left(8-22\right)+\left(-14-13+5\right)-\left(-2-3\right)+1$
$-\frac{12+40}{4}$
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