$20x+10=15x-5$

$-6y+y^2+3-4y^2-7+1-4y$

$\lim_{x\to0}\left(\frac{1+\cos\left(x\right)}{\tan\left(x\right)^2}\right)$

$\int\sin^5\left(5x\right)\cos^4\left(5x\right)dx$

$14acd+7cd-21c^2d^2$

$( 3 x + 6 ) ( 2 x + 4 )$

$\frac{\left(a^4b\right)^3\left(a^2b^4\right)^{-2}}{\left(a^4b^5\right)^7}$