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