$87\cdot8\cdot4$

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

$\frac{5}{1-x}=y+2$

$\lim_{x\to\infty}\left(8\cdot x\cdot e^{\frac{6}{x}}-8\cdot x\right)$

$\frac{\left(\sec\:^2\left(x\right)-\tan^2\left(x\right)\right)}{\csc\left(x\right)}$

$\frac{4-x}{6}=2$

$2x^2+6x+9=0$