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((48*x)/7)*x-4 = 0
48/7*x^2 = 4 // : 48/7
x^2 = 7/12
x^2 = 7/12 // ^ 1/2
abs(x) = (7/12)^(1/2)
x = (7/12)^(1/2) or x = -(7/12)^(1/2)
x in { (7/12)^(1/2), -(7/12)^(1/2) }
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