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)
(1/3)*x^6-((2/3)*x^2) = 0
(1/3)*x^6+(-2/3)*x^2 = 0
1/3*x^6-2/3*x^2 = 0
t_1 = x^2
1/3*t_1^3-2/3*t_1^1 = 0
1/3*t_1^3-2/3*t_1 = 0
1/3*t_1*(t_1^2-2) = 0
1*t_1^2 = 2 // : 1
t_1^2 = 2
t_1^2 = 2 // ^ 1/2
abs(t_1) = 2^(1/2)
t_1 = 2^(1/2) or t_1 = -2^(1/2)
t_1/3 = 0
1/3*t_1 = 0 // : 1/3
t_1 = 0
t_1 = 2^(1/2)
x^2-2^(1/2) = 0
1*x^2 = 2^(1/2) // : 1
x^2 = 2^(1/2)
x^2 = 2^(1/2) // ^ 1/2
abs(x) = 2^(1/4)
x = 2^(1/4) or x = -2^(1/4)
t_1 = -2^(1/2)
x^2+2^(1/2) = 0
1*x^2 = -2^(1/2) // : 1
x^2 = -2^(1/2)
x^2 = 2^(1/2) // ^ 1/2
abs(x) = 2^(1/4)
x = 2^(1/4) or x = -2^(1/4)
t_1 = 0
x^2+0 = 0
x^2 = 0
1*x^2 = 0 // : 1
x^2 = 0
x = 0
x in { 2^(1/4), -2^(1/4), 2^(1/4), -2^(1/4), 0 }
| 9b^2+12b^3=0 | | 9z+8=1 | | 5(2x-1)-3=6x+4 | | (3/5)(4/3) | | 2x+14=-6x-16 | | 39-14=5(x-1) | | 3(x+6)=26 | | x(x^2+4x+3)=0 | | (2t-1)=(t+5) | | 4(x+6)=4(x+12) | | 3a+6=11 | | (x+9)=(x-2) | | 14-2(6-7)/-1(4-8) | | (2-i)(-4-2i)= | | (3b/7)+(2b-5/2)=-4 | | r-1/9=17/9 | | 2x+13=-9x-16 | | 11(3x-9)=-99 | | log64x=1/2 | | 10(2x-6)=19x-64 | | 9(2x+1)=117 | | -(3/5)=(1/2)u-(6/7) | | f(x)=-x^3-24x^2-199x-10 | | b=a+4c | | 5X+36-3X=9X-28+X | | 30x^2+x-120=0 | | X+9=78 | | 3a+2=7a-6 | | -5x-3=5x+17 | | 5x-(-2x)-6=4x+2x+3+4 | | 20/100=180 | | (2x-10)+(x+4)=180 |