$\left(4.3\right)^9:\left(4.3\right)^6$

$\frac{x+3}{x-1}+3<0$

$4a-7a$

$y'=x^3y^{-1}$

$\lim_{x\to0}\left(\frac{x+\sin\left(x\right)}{2x^2-2x}\right)$

$-5\cdot\left(3-2\right)+4\cdot\left(-2+6\right)-\left(-4\right)\cdot\left(+6\right)$

$\int_0^{\infty}\left(x-5\right)^2dx$