X×(x-1)/4+(x-3)^2/2=(4-x)^2/3-1/3
3x*(x-1)+6*(x-3)²=4*(4-x)²-4 3x²-3x+6x²-36x+54=64-32x+4x²-4 5x²-7x-6=0 D=169 x=2 x=-0,6