$2x^3-3x^2-6x+9-5x^3+2x^2-4x+6$
$-7+-16+2$
$\left(-28\right)-\left(-36\right)-\:2$
$-20x=-20$
$\sqrt{36}\cdot\sqrt{49}$
$36a^8b^{12}-9c^{10}$
$-1+2+\left(-15\right)+6+\left(-10\right)+7+3+\left(-8\right)$
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