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(-15/4)*x^4 = -7/4 // + -7/4
(-15/4)*x^4-(-7/4) = 0
(-15/4)*x^4+7/4 = 0
-15/4*x^4 = -7/4 // : -15/4
x^4 = 7/15
x^4 = 7/15 // ^ 1/4
abs(x) = (7/15)^(1/4)
x = (7/15)^(1/4) or x = -(7/15)^(1/4)
x in { (7/15)^(1/4), -(7/15)^(1/4) }
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