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x in (-oo:+oo)
3*x^(4/3)+3 = 51 // - 51
3*x^(4/3)-51+3 = 0
3*x^(4/3) = 48 // : 3
x^(4/3) = 16
x^(4/3) = 16 // ^ 3
x^4 = 4096 // ^ 1/4
abs(x) = 8
x = 8 or x = -8
x in { 8, -8 }
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