tolong bantu jawab pliss.. no 21-25 saja

21. x^2-4x+3 =3-2x
x^2-2x= 0
x(x-2) =0
x=0 V x=2
hp ={0,2}

22. x^2 - 1 -(5x +5)= 0
x^2 -1 -5x -5 = 0
x^2-5x-6= 0
(x-6) (x+1)=0
x= 6 V x = -1
hp {-1,6}

23. (2(x-6)) (x+5)=0
( 2x -12 ) (x + 5)=0
2x^2 + 10x -12x -60=0
2x^2 -2x -60=0 ] : 2
x^2 -x -30 = 0
( x -6) (x+5) =0
x= 6 V x=-5
hp {-5, 6}