$7\left(x+3\right)-3\left(2x-2\right)$
$\left(2x+y\right)^{\left(2\right)}\left(3y-z\right)^{\left(2\right)}$
$\left(3x^2\right)^0$
$\sqrt{\left(\frac{a^2-x^2}{x^2}\right)}$
$x^2+5x+15=0$
$6a^7b^9\cdot2a^{-3}$
$2x^2-16$
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