$ikx+bx^2$
$4900-7000$
$14x+2x-5y-4y$
$\int\frac{1}{8+z^3}dz$
$-20\:.\:-31$
$4+4x+1$
$x\left(1+e^y\right)-e^y\cdot\frac{dy}{dx}=0$
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