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y in (-oo:+oo)
(1/2)*y-1 = 2/5 // - 2/5
(1/2)*y-(2/5)-1 = 0
(1/2)*y-2/5-1 = 0
1/2*y-7/5 = 0 // + 7/5
1/2*y = 7/5 // : 1/2
y = 7/5/1/2
y = 14/5
y = 14/5
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