x(5-x)-(x-5)=0 решите

x( 5 - x) - ( x - 5) = 0
x( 5 - x) + ( 5 - x) = 0
( 5 - x)( x + 1) = 0
5 - x = 0
- x = - 5
x = 5
x + 1 = 0
x = - 1
Ответ: x1 = 5, x2 = - 1.