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Y in (-oo:+oo)
Y = (2/5)*(3-((2/3)*Y))-5 // - (2/5)*(3-((2/3)*Y))-5
Y-((2/5)*(3-((2/3)*Y)))+5 = 0
(-2/5)*((-2/3)*Y+3)+Y+5 = 0
Y-2/5*(3-2/3*Y)+5 = 0
Y-2/5*(3-2/3*Y)+5 = 0
19/15*Y-6/5+5 = 0
19/15*Y+19/5 = 0
19/15*Y+19/5 = 0
19/15*Y+19/5 = 0 // - 19/5
19/15*Y = -19/5 // : 19/15
Y = -19/5/19/15
Y = -3
Y = -3
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