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W/4-2 = 12*x^4 // - 12*x^4
W/4-(12*x^4)-2 = 0
W/4-12*x^4-2 = 0
-12*x^4 = -(1/4*W-2) // : -12
x^4 = (2-(1/4*W))/(-12)
x^4 = (2-1/4*W)/(-12) // ^ 1/4
abs(x) = ((2-1/4*W)^(1/4))/((-12)^(1/4))
x = ((2-1/4*W)^(1/4))/((-12)^(1/4)) or x = -(((2-1/4*W)^(1/4))/((-12)^(1/4)))
x in { ((2-1/4*W)^(1/4))/((-12)^(1/4)), -(((2-1/4*W)^(1/4))/((-12)^(1/4))) }
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