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(7/2)*x^2-4 = 0
7/2*x^2 = 4 // : 7/2
x^2 = 8/7
x^2 = 8/7 // ^ 1/2
abs(x) = (8/7)^(1/2)
x = (8/7)^(1/2) or x = -(8/7)^(1/2)
x in { (8/7)^(1/2), -(8/7)^(1/2) }
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