$\frac{d}{dy}e^x\left(2xy+x^2y+\frac{y^3}{3}\right)$
$36x^2-\frac{16}{25}y^2$
$b^2+3+2b^2+4-7$
$\int_0^{\infty}\left(\frac{-49\cdot\cos\left(x\right)}{20\cdot x}\right)dx$
$x^{2\:}+6x=7$
$2x^2+4x-48=0$
$81^{2x+4}\cdot\:9^{3x-5}=243^{-14}$
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