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y in (-oo:+oo)
(2/4)*y-1 = 1/4 // - 1/4
(2/4)*y-(1/4)-1 = 0
(2/4)*y-1/4-1 = 0
1/2*y-5/4 = 0 // + 5/4
1/2*y = 5/4 // : 1/2
y = 5/4/1/2
y = 5/2
y = 5/2
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