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y in (-oo:+oo)
(-3/4)*(y-(2/5)) = (-1/3)*(y-(1/5)) // - (-1/3)*(y-(1/5))
(-3/4)*(y-(2/5))-((-1/3)*(y-(1/5))) = 0
(-3/4)*(y-2/5)+(1/3)*(y-1/5) = 0
1/3*(y-1/5)-3/4*(y-2/5) = 0
1/3*(y-1/5)-3/4*(y-2/5) = 0
7/30-5/12*y = 0
7/30-5/12*y = 0
7/30-5/12*y = 0 // - 7/30
-5/12*y = -7/30 // : -5/12
y = -7/30/(-5/12)
y = 14/25
y = 14/25
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