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6-(4/7)-2 = 5*((3*x^4)/7-4) // - 5*((3*x^4)/7-4)
6-(5*((3*x^4)/7-4))-(4/7)-2 = 0
6-5*((3*x^4)/7-4)-4/7-2 = 0
6-5*(3/7*x^4-4)-4/7-2 = 0
(-5*7*(3/7*x^4-4))/7-4/7+(-2*7)/7+(6*7)/7 = 0
6*7-5*7*(3/7*x^4-4)-2*7-4 = 0
42-15*x^4-14+136 = 0
42-15*x^4+122 = 0
164-15*x^4 = 0
(164-15*x^4)/7 = 0
(164-15*x^4)/7 = 0 // * 7
164-15*x^4 = 0
-15*x^4 = -164 // : -15
x^4 = 164/15
x^4 = 164/15 // ^ 1/4
abs(x) = (164/15)^(1/4)
x = (164/15)^(1/4) or x = -(164/15)^(1/4)
x in { (164/15)^(1/4), -(164/15)^(1/4) }
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