Solve By Factoring: X^2 - 9x = -20 Show Work?

X²-9x=-20
Shifting -20 to the other side:
X²-9x+20=0
Factorizing:
X²-5x-4x+20=0
Taking common:
x(x-5)-4(x-5)=0
So:
(x-5)(x-4)=0
Hence:
x-5=0 or x-4=0
x=5 or x=4

X^2 - 9x + 20 = 0
x^2 - 5x - 4x + 20 = 0
x(x-5)-4(x-5) = 0
(x-4)(x-5)=0
x = 4,5