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y in (-oo:+oo)
(1/8)*y^2-(3/4)-(7/8) = 0
(1/8)*y^2-3/4-7/8 = 0
1/8*y^2 = 13/8 // : 1/8
y^2 = 13
y^2 = 13 // ^ 1/2
abs(y) = 13^(1/2)
y = 13^(1/2) or y = -13^(1/2)
y in { 13^(1/2), -13^(1/2) }
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