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y in (-oo:+oo)
(2/3)*(y-(4/5)) = (-1/5)*(y-6) // - (-1/5)*(y-6)
(2/3)*(y-(4/5))-((-1/5)*(y-6)) = 0
(2/3)*(y-4/5)+(1/5)*(y-6) = 0
2/3*(y-4/5)+1/5*(y-6) = 0
2/3*(y-4/5)+1/5*(y-6) = 0
13/15*y-26/15 = 0
13/15*y-26/15 = 0
13/15*y-26/15 = 0 // + 26/15
13/15*y = 26/15 // : 13/15
y = 26/15/13/15
y = 2
y = 2
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