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y in (-oo:+oo)
(2/5)*(y-(4/5)) = 3/5 // - 3/5
(2/5)*(y-(4/5))-(3/5) = 0
(2/5)*(y-4/5)-3/5 = 0
2/5*(y-4/5)-3/5 = 0
(2/5*5*(y-4/5))/5-3/5 = 0
2/5*5*(y-4/5)-3 = 0
2*y-23/5 = 0
(2*y-23/5)/5 = 0
(2*y-23/5)/5 = 0 // * 5
2*y-23/5 = 0
2*y-23/5 = 0 // + 23/5
2*y = 23/5 // : 2
y = 23/5/2
y = 23/10
y = 23/10
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