$-27-\left(-7\right)$
$4x^2-16x-36$
$-\left(3x^5\right)^2$
$3^2+\left(-4\right)^2$
$-4+9+-5\cdot6$
$2b\:+\:4\:-\:3c\:+\:2b$
$\frac{-6x^3-x^2+2x-1}{x^2-1}$
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