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Y in (-oo:+oo)
(-1/5)*(Y-3) = (3/8)*(Y+3) // - (3/8)*(Y+3)
(-1/5)*(Y-3)-((3/8)*(Y+3)) = 0
(-1/5)*(Y-3)+(-3/8)*(Y+3) = 0
-1/5*(Y-3)-3/8*(Y+3) = 0
-1/5*(Y-3)-3/8*(Y+3) = 0
-23/40*Y-21/40 = 0
-23/40*Y-21/40 = 0
-23/40*Y-21/40 = 0 // + 21/40
-23/40*Y = 21/40 // : -23/40
Y = 21/40/(-23/40)
Y = -21/23
Y = -21/23
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