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(9*x^2-25)/4 = 0
9*x^2 = 25 // : 9
x^2 = 25/9
x^2 = 25/9 // ^ 1/2
abs(x) = 5/3
x = 5/3 or x = -5/3
x in { 5/3, -5/3 }
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