$\left(5x^2+2x-3\right)+\left(7-3x+4x^2\right)$
$3^a\:+\:86^4$
$\frac{x^3a^5+xa^8}{x^2a^6}$
$\left(-13\right)^2-\left(10\right)^2$
$\left(z^2+5\right)\left(z^2-5\right)$
$\left(3x-2y\right)^{5}$
$\frac{8^4}{2^2}$
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