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C in (-oo:+oo)
C^2 = 25/36 // - 25/36
C^2-(25/36) = 0
C^2-25/36 = 0
1*C^2 = 25/36 // : 1
C^2 = 25/36
C^2 = 25/36 // ^ 1/2
abs(C) = 5/6
C = 5/6 or C = -5/6
C in { 5/6, -5/6 }
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