$\frac{5x^2-8x-x^3-50}{x+4}$
$0.3a+0.4b+0.5c-0.6a-0.7b-0.9c-3a-3b-3c$
$\left(a^{n+2}b^{n+1}\right)^2$
$\frac{27p^{12}-8q^3}{3p^4-2q}$
$\left(2b^3-b+1\right)\left(b+3\right)$
$\left(9\right)+\left(-13\right)-\left(-12\right)$
$1-\frac{1}{-1}$
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