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y in (-oo:+oo)
(-1/9)*(y-(1/5)) = (-1/5)*(y-5) // - (-1/5)*(y-5)
(-1/9)*(y-(1/5))-((-1/5)*(y-5)) = 0
(-1/9)*(y-1/5)+(1/5)*(y-5) = 0
1/5*(y-5)-1/9*(y-1/5) = 0
1/5*(y-5)-1/9*(y-1/5) = 0
4/45*y-44/45 = 0
4/45*y-44/45 = 0
4/45*y-44/45 = 0 // + 44/45
4/45*y = 44/45 // : 4/45
y = 44/45/4/45
y = 11
y = 11
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