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x in (-oo:+oo)
((3*x^42)/3-54+30)/3 = 0
(x^42-24)/3 = 0
1*x^42 = 24 // : 1
x^42 = 24
x^42 = 24 // ^ 1/42
abs(x) = 24^(1/42)
x = 24^(1/42) or x = -24^(1/42)
x in { 24^(1/42), -24^(1/42) }
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