$x^2=15x+54$
$\left(\frac{3+5x}{5x}\right)\left(5-4x\right)$
$\left(\sqrt{7}\right)^{-4}$
$m^{3-1}r^{3-1}-1^{-2}+m^{3-3}r^{3-3}1^2+1^{-1}$
$\left(3\sqrt{5}a-2\sqrt{5}b^3\right)^2$
$2q+2q^2+2q^6$
$-2\left(3y+z\right)-7z-4\left(3z+8y\right)$
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