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)
x^4 = (1/3)*(x^2-(2/27)) // - (1/3)*(x^2-(2/27))
x^4-((1/3)*(x^2-(2/27))) = 0
(-1/3)*(x^2-2/27)+x^4 = 0
x^4-1/3*(x^2-2/27) = 0
x^4-1/3*(x^2-2/27) = 0
x^4-1/3*x^2+2/81 = 0
x^4-1/3*x^2+2/81 = 0
x^4+(-1/3)*x^2+2/81 = 0
x^4+(-1/3)*x^2+2/81 = 0 // * 0
{ 1, -1, 2, -2 }
1
x = 1
81*x^4-27*x^2+2 = 56
1
-1
x = -1
81*x^4-27*x^2+2 = 56
-1
2
x = 2
81*x^4-27*x^2+2 = 1190
2
-2
x = -2
81*x^4-27*x^2+2 = 1190
-2
{ 1/3, -1/3, 1/9, -1/9, 1/27, -1/27, 1/81, -1/81, -1/3, 1/3, -1/9, 1/9, -1/27, 1/27, -1/81, 1/81, 2/3, -2/3, 2/9, -2/9, 2/27, -2/27, 2/81, -2/81, -2/3, 2/3, -2/9, 2/9, -2/27, 2/27, -2/81, 2/81 }
1/3
x
1/3
81*x^4-27*x^2+2 = 0
1/3
x-1/3
81*x^3+27*x^2-18*x-6
81*x^4-27*x^2+2
x-1/3
27*x^3-81*x^4
27*x^3-27*x^2+2
9*x^2-27*x^3
2-18*x^2
18*x^2-6*x
2-6*x
6*x-2
0
81*x^3+27*x^2-18*x-6 = 0
{ 1, -1, 2, -2, 3, -3, 6, -6 }
1
x = 1
81*x^3+27*x^2-18*x-6 = 84
1
-1
x = -1
81*x^3+27*x^2-18*x-6 = -42
-1
2
x = 2
81*x^3+27*x^2-18*x-6 = 714
2
-2
x = -2
81*x^3+27*x^2-18*x-6 = -510
-2
3
x = 3
81*x^3+27*x^2-18*x-6 = 2370
3
-3
x = -3
81*x^3+27*x^2-18*x-6 = -1896
-3
6
x = 6
81*x^3+27*x^2-18*x-6 = 18354
6
-6
x = -6
81*x^3+27*x^2-18*x-6 = -16422
-6
{ 1/3, -1/3, 1/9, -1/9, 1/27, -1/27, 1/81, -1/81, -1/3, 1/3, -1/9, 1/9, -1/27, 1/27, -1/81, 1/81, 2/3, -2/3, 2/9, -2/9, 2/27, -2/27, 2/81, -2/81, -2/3, 2/3, -2/9, 2/9, -2/27, 2/27, -2/81, 2/81, 3/3, -3/3, 3/9, -3/9, 3/27, -3/27, 3/81, -3/81, -3/3, 3/3, -3/9, 3/9, -3/27, 3/27, -3/81, 3/81, 6/3, -6/3, 6/9, -6/9, 6/27, -6/27, 6/81, -6/81, -6/3, 6/3, -6/9, 6/9, -6/27, 6/27, -6/81, 6/81 }
1/3
x
1/3
81*x^3+27*x^2-18*x-6 = -6
1/3
-1/3
x
-1/3
81*x^3+27*x^2-18*x-6 = 0
-1/3
x+1/3
81*x^2-18
81*x^3+27*x^2-18*x-6
x+1/3
-81*x^3-27*x^2
-18*x-6
18*x+6
0
81*x^2-18 = 0
DELTA = 0^2-(-18*4*81)
DELTA = 5832
DELTA > 0
x = (5832^(1/2)+0)/(2*81) or x = (0-5832^(1/2))/(2*81)
x = (2^(1/2))/3 or x = (-2^(1/2))/3
x in { (-2^(1/2))/3, (2^(1/2))/3, 1/3, -1/3}
(x-((-2^(1/2))/3))*(x-((2^(1/2))/3))*(x-1/3)*(x+1/3) = 0
(x-((-2^(1/2))/3))*(x-((2^(1/2))/3))*(x-1/3)*(x+1/3) = 0
( x+1/3 )
x+1/3 = 0 // - 1/3
x = -1/3
( x-((-2^(1/2))/3) )
x-((-2^(1/2))/3) = 0 // + (-2^(1/2))/3
x = (-2^(1/2))/3
( x-((2^(1/2))/3) )
x-((2^(1/2))/3) = 0 // + (2^(1/2))/3
x = (2^(1/2))/3
( x-1/3 )
x-1/3 = 0 // + 1/3
x = 1/3
x in { -1/3, (-2^(1/2))/3, (2^(1/2))/3, 1/3 }
| -2x-8-2x=2x+8 | | a+a-6=180 | | 5+5(1-5n)=-140 | | 3x-9+3=38 | | 5/30×6/30 | | z+2.5=5.2+3.2z | | 3x-9+4=38 | | 8x-10x=-3 | | 20=10+2y | | (3x^2+5x-12)-(x^2+4x+9)=5x^2+x-18 | | -2x+4.75=-2x-8.75 | | 5x-43+4x=39 | | p=2x^2+20x+306 | | 3a-3=3+4a | | 0=5(x+3)+2(x-5) | | 360=11x-3 | | -(2x-7)+3=14 | | (3x^2+5x-12)-(x^2+4x+9)=x^2+13x+6 | | 3a-3=3+a | | (2cosx+3)(sinx+1)=0 | | 12*7=v | | (3x^2+5x-12)-(x^2+4x+9)=x^2-3x-30 | | 5x-1.25=2x-1.25+7x | | b/6-4=0 | | 4g+2(-7+2g)=-g | | 2(w-3)+5=3(2w-1) | | P(-2)=3x^3-6x^2+2x-12 | | 24=3(x-5) | | 610=m-14 | | (x+5)=11 | | (6x-4)-(3x+8)=3(x-12) | | (-3).2= |