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