$-\frac{4}{7}n+\left(-\frac{2}{7}n\right)+\frac{1}{7}$

$36+121c^2-132c$

$17+12+67+39+-19$

$\left(x+y\right)dx+\left(x-y-2\right)dy=0$

$f\left(x\right)=2x^4\left(x^2-9x\right)$

$8x^3-12x^2y^3$

$\lim_{x\to0}\left(\frac{\sin^2\left(x\right)-x^2}{\left(e^2\right)}\right)$