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((5*x)/7)*x-49 = 0
5/7*x^2 = 49 // : 5/7
x^2 = 343/5
x^2 = 343/5 // ^ 1/2
abs(x) = (343/5)^(1/2)
x = (343/5)^(1/2) or x = -(343/5)^(1/2)
x in { (343/5)^(1/2), -(343/5)^(1/2) }
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