$3\left(-1\right)^5+5\left(-1\right)^4-43\left(-1\right)^3+7\left(-1\right)+3$
$\frac{x^2+\frac{1}{2}-2}{x+2}$
$n^2-25$
$\frac{12a^6}{3a^3}$
$2^{-4}.\:2^6$
$\frac{2x^2+x+1}{x-1}$
$6x+54\ge12$
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