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y in (-oo:+oo)
(-1/2)*y+1/5 = -1/6 // + -1/6
(-1/2)*y+1/5-(-1/6) = 0
(-1/2)*y+1/5+1/6 = 0
11/30-1/2*y = 0 // - 11/30
-1/2*y = -11/30 // : -1/2
y = -11/30/(-1/2)
y = 11/15
y = 11/15
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