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x in (-oo:+oo)
x^(2/5)-49 = 0
1*x^(2/5) = 49 // : 1
x^(2/5) = 49
x^(2/5) = 49 // ^ 5
x^2 = 282475249 // ^ 1/2
abs(x) = 16807
x = 16807 or x = -16807
x in { 16807, -16807 }
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