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