$\frac{2x^4}{x^2-3}$
$-7+4^2$
$\sqrt[4]{x^{3a}\cdot\sqrt[3]{x^{2a}}}$
$c^2-2cd+d^2$
$\left(3x^3y^2-5x^2\right)^3$
$6\left(x+8\right)-2x$
$6x-10x+20$
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