2x²+1=3x
2x²-3x+1=0
(2x-1)(x-1)=0
x1=1/2 x2=1
(x-3)²+4x(x-3)=0
(x-3)(x-3+4x)=0
(x-3)(5x-3)=0
x1=3 x2=3/5