$6x^2+4x-2$
$-28-\left(-40\right)$
$\frac{\frac{d^2}{dx^2}\left(2\right)}{2x+7}$
$-4\cdot\left(-12+4\right)$
$3+w=-7$
$-2\left(-3\right)^2-3$
$\log\left(x\right)+\log\left(x^2-4\right)-\log\left(15\right)-\log\left(x+2\right)$
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