$2\left[\left(30-2x\right)\left(x\right)\right]$
$\frac{2}{5}x-19=-5$
$\left(x+2\right)^2=x^2-4x+4$
$\int\left(10e^{-x^2}\right)dx$
$y'-y=2xe^{2e\:}\:\:\:\:\:y\left(0\right)=1$
$35x^2+9x-2+2x=0$
$t^4-7t$
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