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x in (-oo:+oo)
x^(2/3)-(2*x^(1/3))-15 = 0
x^(2/3)-2*x^(1/3)-15 = 0
t_1 = x^(1/3)
1*t_1^2-2*t_1^1-15 = 0
t_1^2-2*t_1-15 = 0
DELTA = (-2)^2-(-15*1*4)
DELTA = 64
DELTA > 0
t_1 = (64^(1/2)+2)/(1*2) or t_1 = (2-64^(1/2))/(1*2)
t_1 = 5 or t_1 = -3
t_1 = -3
x^(1/3)+3 = 0
1*x^(1/3) = -3 // : 1
x^(1/3) = -3
( -3 < 0 i 1/3 in (0:1) ) => x należy do O
t_1 = 5
x^(1/3)-5 = 0
1*x^(1/3) = 5 // : 1
x^(1/3) = 5
x^(1/3) = 5 // ^ 3
x = 125
x = 125
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