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y in (-oo:+oo)
2.5*(y-(4/5)) = 3/10 // - 3/10
2.5*(y-(4/5))-(3/10) = 0
2.5*(y-4/5)-3/10 = 0
(2.5*10*(y-4/5))/10-3/10 = 0
2.5*10*(y-4/5)-3 = 0
25*y-23 = 0
(25*y-23)/10 = 0
(25*y-23)/10 = 0 // * 10
25*y-23 = 0
25*y-23 = 0 // + 23
25*y = 23 // : 25
y = 23/25
y = 23/25
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