3x^3-(4-3*7^0.5)x^2+3*7^0.5*x-7=0
3x^3-4x^2+3*7^0.5*x^2+3*7^0.5*x-7=0
3x^3-4x^2+3*7^0.5*x^2-7=-3*7^0.5*x
x^3-4/3*x^2+7^0.5*x^2-7/3=-7^0.5*x
x^4-4/3*x^3+7^0.5*x^3-7x/3=-7^0.5*x^2
x^4+7^0.5*x^3-7x/3=-7^0.5*x^2+-4/3*x^3+
x^4+7^0.5*x^3-7x^2-3*7^0.5*x+2