Solve for x:
(x-80) (x-2) = x^2-10 x
Expand out terms of the left hand side:
x^2-82 x+160 = x^2-10 x
Subtract x^2-10 x from both sides:
160-72 x = 0
Factor constant terms from the left hand side:
-8 (9 x-20) = 0
Divide both sides by -8:
9 x-20 = 0
Add 20 to both sides:
9 x = 20
Divide both sides by 9:
Answer: | x = 20/9