If it's not what You are looking for type in the equation solver your own equation and let us solve it.
x in (-oo:+oo)
((4/27)*x^4)/3 = 1 // - 1
((4/27)*x^4)/3-1 = 0
4/81*x^4 = 1 // : 4/81
x^4 = 81/4
x^4 = 81/4 // ^ 1/4
abs(x) = (81/4)^(1/4)
x = (81/4)^(1/4) or x = -(81/4)^(1/4)
x in { (81/4)^(1/4), -(81/4)^(1/4) }
| -3(6-3n)=-6 | | 8x(x-5)=(2x+5)(x-5) | | ln(x-3)+ln(5)=ln(x+17) | | x^3/25/3 | | x+5+6=-5 | | 5/8(b-40) | | 7x=2-3y | | x^2+y^2=584 | | 62.4d-210=13 | | 5x-6/x-4 | | 3tan^2(x)-9=0 | | y=6x^2+2-5 | | 8x+45=2x | | -4v+6+5v=31 | | 4x-13=-42-7x | | 8x+64=220 | | 2x+5x-12=0 | | 2+1.25f=10-2.5f | | log(6x+7)-log(x-4)=1 | | 7x+6=4x+45 | | 4(2x-1)=2(2x+3)+3 | | -11_c/2 | | 4x^2-y+8y+32=0 | | 4.9x^2-68x-4.1=0 | | .5(37)(51)(x)=.5(51)(90)(y) | | 1+8x=64x+46 | | 3m^2+2m=6 | | X+2=3x+5 | | -3+8(1-6d)=18 | | x^2-4y^2-6x=0 | | 4x+6=-3x-1 | | 8x+5y=45 |