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((3*x)/7)*x-49 = 0
3/7*x^2 = 49 // : 3/7
x^2 = 343/3
x^2 = 343/3 // ^ 1/2
abs(x) = (343/3)^(1/2)
x = (343/3)^(1/2) or x = -(343/3)^(1/2)
x in { (343/3)^(1/2), -(343/3)^(1/2) }
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