$\frac{-14x-51}{-4x-21}$
$\left(-2\right)-\left(-3\right)-\left(-7\right)$
$3x+2y+9x+8y$
$\frac{3}{5}x^2y+\left(-\frac{1}{3}x^2y\right)+\left(2\frac{3}{4}x^2y\right)$
$\:k^2-14k-68=-2$
$\left(-5\right)\cdot6+\left(-2\right)\cdot\left(-9\right)$
$\int-3x^2e^xdx$
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