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x in (-oo:+oo)
x^2 = 49/16 // - 49/16
x^2-(49/16) = 0
x^2-49/16 = 0
1*x^2 = 49/16 // : 1
x^2 = 49/16
x^2 = 49/16 // ^ 1/2
abs(x) = 7/4
x = 7/4 or x = -7/4
x in { 7/4, -7/4 }
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