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x in (-oo:+oo)
x^2-(49/64) = 0
x^2-49/64 = 0
1*x^2 = 49/64 // : 1
x^2 = 49/64
x^2 = 49/64 // ^ 1/2
abs(x) = 7/8
x = 7/8 or x = -7/8
x in { 7/8, -7/8 }
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