$\log_a\left(x-4\right)+\log_a\left(x\right)=\log_a\left(12\right)$

$2\cdot\left(-3\right)-5+7-\left(-2\right)\cdot\left(-3\right)$

$\frac{\tan\left(x\right)}{\sec\left(x\right)+1}$

$f\:\left(x\right)=\sqrt{x^2+1x-15}$

$\frac{1}{100}-x^2^n$

$\frac{5}{x+1}=\frac{6}{x-1}$

$-147xym^2=-147x^3y^2m^2$