$\frac{y^6}{y^{-3}}$
$7a-4b+5\:-7a+4a-6c$
$25x^2+20$
$37.2+5.46$
$a2\:-\:ab$
$\left(y^4\left(2y^3\right)\right)^{-2}$
$\sqrt{x+8}=3$
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