hi
-5x -9 = -5 (x+3)
-5x -9 = -5x -15
-5x +5x -9 = -5x +5x -15
-9 = -15
As the last line does not make sense, and as we did not breach any math rule, the conclusion is that -5x-9 = -5 (x+3) has no answers.
No value for X will make -5x-9 equal -5 (x+3)