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x in (-oo:+oo)
(7*x^4)/6 = 112 // - 112
(7*x^4)/6-112 = 0
7/6*x^4 = 112 // : 7/6
x^4 = 96
x^4 = 96 // ^ 1/4
abs(x) = 2*6^(1/4)
x = 2*6^(1/4) or x = -(2*6^(1/4))
x in { 2*6^(1/4), -(2*6^(1/4)) }
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