Want more proof on the fact that I know what are and when to use All Real Numbers and No Solution? Check these out!

7x - (3x - 4) = 7x + 9

7x - 3x + 4 = 7x +9

4x + 4 = 7x + 9

NO SOLUTION.

9x ( 3x - 1) = 3 (9x² - 3x)

 27x² - 9x = 27x² - 9x 

                                              + 9x           +9x 

27x² = 27x² 

ALL REAL NUMBERS. 

 Never should you doubt my skills. I shall simply prove you wrong.  :)