$3\left(2x-1\right)-4\left(5x-2\right)$

$\left(8y-9x\right)^2$

$\left(y\right)\frac{dy}{dx}=x\left(y^2-1\right)$

$\frac{x^2-16}{x^2-5+6}$

$\left(3y\frac{2}{3}\right)^3\left(2y^2\right)^2$

$12+\left(4-\left(-15-\left(1+2\right)-10\right)\right)$

$x+\frac{1}{x}=\sqrt{7}$