TeX джерело:

\begin{array}{l}(5{x^7} - 2{x^5} + 3{x^2} + 6x):2x = 5{x^7}:2x - 2{x^5}:2x + 3{x^2}:2x + 6x:2x = \\ = 2,5{x^6} - {x^4} + 1,5x + 3\end{array}