$\left(x-7\right)\left(+7\right)=x^2+49$
$a^7-a$
$\left(64r\right)^{-\frac{7}{6}}$
$\frac{2a+2b}{\sqrt{a+b}}$
$2y+15=4y-45$
$\frac{3}{2}\:\frac{1}{\sqrt{x^3}}+x$
$-8x^2-15+2$
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