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x^2-(9/4) = 0
x^2-9/4 = 0
1*x^2 = 9/4 // : 1
x^2 = 9/4
x^2 = 9/4 // ^ 1/2
abs(x) = 3/2
x = 3/2 or x = -3/2
x in { 3/2, -3/2 }
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