$\left(a^2\right)^{-3}$
$\left(x^2-3y^4\right)^3$
$\left(x^{-3}.z^4\right)^5$
$\sqrt{x+9}+2=7$
$2\left(x-4\right)=7-3x$
$6x-10=-16$
$7x<0$
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