$45x+30$

$4abc-3abc+5abc+cab-4abc$

$\left(-2\right)-\left|\left(-6\right)-\left(-14\right)\right|\cdot\left|\left(-15\right)+2\right|$

$\frac{\frac{x^6}{27}-347y}{\frac{x^2}{3}-7\sqrt[3]{y}}$

$\frac{dy}{dt}=4-y$

$\int_{-\frac{1}{2}}^{\frac{1}{2}}\left(\frac{x^2+1}{x^2-1}\right)dx$

$\left(\frac{3}{5}x\right)^2-\frac{1}{2}\:\left(\frac{3}{5}x\right)^2+\frac{1}{2}$