$\left(2a+3\right)+\left(3a-7\right)$
$81,92+67,13+50,38$
$178.288=33.2-x$
$-28\::\:\left(\left(-12+9\right)-\left(9-12:3\right)+1\right)$
$6a^2+a^2\frac{1}{3}a^2$
$\frac{dy}{dx}=\frac{2x^2}{3y}$
$3x^2+3x+4-4x+3$
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