$\frac{7^{m+1}-7^{m-1}}{7^{m-1}}$
$\frac{6x^4-x^{3\:}-8x^2+x+2}{2x^2-x-1}$
$99-0.161$
$-a+7a-11a-20+26a$
$\frac{-7x+5x^2+2x^3+6}{x+7}$
$\int x^n\:\ln\left(x\right)dx$
$\left(2xy^2-3\right)dx+\left(2x^2y+5\right)dy=0$
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