$4\cdot\left(x^2+3x-1\right)-2x\cdot\left(3x+5\right)$

$y=\:ce^{-3x}+ce^{-3x}$

$12xy-12xy+xy$

$\left(6^7\right)^8$

$x^{3}e^{2x^{2}+2y^{2}}dx-y^{3}e^{-x^{2}-2y^{2}}dy=0$

$\left(\frac{2}{5}x^2+\frac{1}{4}\right)\left(\frac{2}{5}x^2-\frac{3}{5}\right)$

$\int2v\left(2x-3\right)dx$