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y in (-oo:+oo)
(-3/4)*y^2 = -3/64 // + -3/64
(-3/4)*y^2-(-3/64) = 0
(-3/4)*y^2+3/64 = 0
-3/4*y^2 = -3/64 // : -3/4
y^2 = 1/16
y^2 = 1/16 // ^ 1/2
abs(y) = 1/4
y = 1/4 or y = -1/4
y in { 1/4, -1/4 }
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