$\left(-8\right)+7-6-\left(-3\right)$
$100-\left(250\right)-\left(-300\right)$
$\frac{x^2+3x+4}{x^2-1}$
$\left(-3\right)^2-4\left(2\right)\left(-2\right)$
$\frac{11^2}{6^0}$
$\left(x^4-x^2-x\right)\left(x^3+x^2+x\right)$
$3x^4+4x^2-x^3+1+\frac{2}{3}x^2-5$
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