$5x+2y=2$

$\cos\left(3x^2+5x\right)$

$\left(\frac{5^{-4}\cdot5^{-1}}{3^2\cdot5^{-3}}\right)^{-\frac{1}{2}\left(\frac{3^4\cdot5^3}{3^2\cdot5^4}\right)^{-1}}$

$\left(-1+6x^2-7x\right)-\left(-2x^2-5x+7\right)$

$\left(\frac{10}{\left(\sqrt{3x+5}\right)+\left(\sqrt{x-3}\right)}\right)$

$\lim_{x\to2}\left(\frac{2x^2}{x-2}-\frac{5}{\ln\left(x-1\right)}\right)$

$t\frac{dr}{dt}+t^3+t^2=r+5$