$x^3+x^2a+x^2a+a^3$
$-7-6x=21-2x$
$\frac{x^3-2x^2-16x-8}{x-2}$
$\frac{\left(7-x^2\right)}{\left(x+6\right)}$
$\left(2a^3+b^4\right)^2$
$9\int\frac{u}{\sqrt{\left(1-x^2\right)}}dx$
$\frac{\left(-3\right)^4}{-3}$
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