Solve for x:
2 (x - 5) (2 x + 1) = 0
Divide both sides by 2:
(x - 5) (2 x + 1) = 0
Split into two equations:
x - 5 = 0 or 2 x + 1 = 0
Add 5 to both sides:
x = 5 or 2 x + 1 = 0
Subtract 1 from both sides:
x = 5 or 2 x = -1
Divide both sides by 2:
Answer: |x = 5 or x = -1/2