A primary property of real numbers is that if AB=0, then either A=0 or B=0 (or both), where A and B are real numbers.
Therefore, in your problem,each of the factors can/must be set=0.
The constant multiplier divides out.
The first factor provides x=-8.62
The second factor provides x=±√11.
The third factor provides x=46.3 (because the only time x7=0 is when x=0.