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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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