$\left(+1300\right)-\left(-780\right)$
$5n+5=45$
$f\left(x\right)=\left(3+2x\right)e^{-3x}$
$y\cdot\frac{dy}{dx}=4x\cdot\sin\left(x^2+\pi\right)$
$100+140c+49c^2$
$x^3+x^2-2x=0$
$x^3-5x+4\:-\:x^3-4x-8$
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