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x in (-oo:+oo)
16*x^2 = 81*x^(2/3) // - 81*x^(2/3)
16*x^2-(81*x^(2/3)) = 0
16*x^2-81*x^(2/3) = 0
t_1 = x^(2/3)
16*t_1^3-81*t_1^1 = 0
16*t_1^3-81*t_1 = 0
t_1*(16*t_1^2-81) = 0
16*t_1^2 = 81 // : 16
t_1^2 = 81/16
t_1^2 = 81/16 // ^ 1/2
abs(t_1) = 9/4
t_1 = 9/4 or t_1 = -9/4
t_1 = 0
t_1 = 0
t_1 = 9/4
x^(2/3)-9/4 = 0
1*x^(2/3) = 9/4 // : 1
x^(2/3) = 9/4
x^(2/3) = 9/4 // ^ 3
x^2 = 729/64 // ^ 1/2
abs(x) = 27/8
x = 27/8 or x = -27/8
t_1 = -9/4
x^(2/3)+9/4 = 0
1*x^(2/3) = -9/4 // : 1
x^(2/3) = -9/4
( -9/4 < 0 i 2/3 in (0:1) ) => x należy do O
t_1 = 0
x^(2/3)+0 = 0
x^(2/3) = 0
1*x^(2/3) = 0 // : 1
x^(2/3) = 0
x = 0
x in { 27/8, -27/8, 0 }
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