$7\left(2x-1\right)-3x\le2\left(x+1\right)-9$

$\log\left(x\right)+\log\left(y\right)-k\log\left(r\right)$

$4y\:\frac{dx}{dy}=x^2+1$

$\left(-24\right)-\left(-6\right)$

$3m^2+5n^2-8m-4n+5m-8m^2+5n-9n^2+5m^2-9m+2n$

$\int\left(t\:sin\left(5-t^2\right)\right)dx$

$\frac{d^3}{dx^3}\left(8\sqrt{x-5}\right)$