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y in (-oo:+oo)
(5/8)*(y-(2/5)) = -4/12 // + -4/12
(5/8)*(y-(2/5))-(-4/12) = 0
(5/8)*(y-2/5)+1/3 = 0
5/8*(y-2/5)+1/3 = 0
(5/8*3*(y-2/5))/3+1/3 = 0
5/8*3*(y-2/5)+1 = 0
15/8*y+1/4 = 0
(15/8*y+1/4)/3 = 0
(15/8*y+1/4)/3 = 0 // * 3
15/8*y+1/4 = 0
15/8*y+1/4 = 0 // - 1/4
15/8*y = -1/4 // : 15/8
y = -1/4/15/8
y = -2/15
y = -2/15
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