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y in (-oo:+oo)
(4*y+3/5)*(4*y+3/5) = 0
(4*y+3/5)^2 = 0
4*y+3/5 = 0 // - 3/5
4*y = -3/5 // : 4
y = -3/5/4
y = -3/20
y in { -3/20, -3/20 }
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