$x'\left(t\right)=3e^t-x$

$\log\left(x+8\right)=\log\left(x\right)+\log\left(x+3\right)$

$7x+2y-4x+6-3x+6y$

$-\left(5x^{5}-2x^{3}+5x-4\right)+\left(3+4x-5x^{3}+7x^{5}\right)$

$2+10+1+9m-3m+8$

$\frac{dy}{dx}=\sin\left(2x\right)=y\cos\left(2x\right)$

$\cos^2\left(x\right).\cot^2\left(x\right)=\frac{1}{\tan^2\left(x\right)}-1+\sin^2\left(x\right)$