$\frac{m-1}{m^2-7m+6}$

$\frac{x^2-9}{x^2-2}$

$\int\left(v\cdot e^{-\frac{\left(mv^2\right)}{2kt}}\right)dv$

$2x+7=19$

$\frac{cos\left(y\right)}{sin\left(y\right)-1}+\frac{cos\left(y\right)}{sin\left(y\right)+1}=-2tan\left(y\right)$

$2x^2+10x=\left(x^2+5\right)$

$\int\frac{t^2}{e^{3t^3}}dx$