$20a^2+23a-7$
$-3\cdot4\cdot\left(-2\right)\cdot\left(-7\right)$
$-5x^{-3}$
$\left(1-\frac{3}{8}a\right)^3$
$4^70\:2$
$\frac{20x^5-15x^6}{-5x^5}$
$\left(a^2b+\frac{8}{3}\right)\left(a^2b-\frac{8}{3}\right)$
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