$-9mn-7mn$
$4n+4+1+3n$
$\ln\left(y^3\right)-4\ln\left(y\right)$
$\int\left(\frac{x}{3}+40\right)^4dx$
$10\left(0.4+0.5g\right)=4g$
$7 x - 10 x ^ { 2 } + 15 x ^ { 2 }$
$x\frac{dy}{dx}+4y=2x^2$
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