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y in (-oo:+oo)
-2*y = 1/5 // - 1/5
-2*y-(1/5) = 0
-2*y-1/5 = 0
-2*y-1/5 = 0 // + 1/5
-2*y = 1/5 // : -2
y = 1/5/(-2)
y = -1/10
y = -1/10
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