$6a+20a^2b$
$29-\left(-9\right)+\left(-18\right)-42$
$-2+1+2$
$\frac{dy}{dx}=\frac{y}{x\log\left(x\right)}$
$8-16+2\left(4-1+6\right)+21$
$-x^3+2x^2+5x-6$
$x^4+7x^2+12$
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