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y in (-oo:+oo)
(-3/4)*(y-(2/5)) = (-1/8)*(y-(1/5)) // - (-1/8)*(y-(1/5))
(-3/4)*(y-(2/5))-((-1/8)*(y-(1/5))) = 0
(-3/4)*(y-2/5)+(1/8)*(y-1/5) = 0
1/8*(y-1/5)-3/4*(y-2/5) = 0
1/8*(y-1/5)-3/4*(y-2/5) = 0
11/40-5/8*y = 0
11/40-5/8*y = 0
11/40-5/8*y = 0 // - 11/40
-5/8*y = -11/40 // : -5/8
y = -11/40/(-5/8)
y = 11/25
y = 11/25
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