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y in (-oo:+oo)
6*y = (4/5)*(2*y-3) // - (4/5)*(2*y-3)
6*y-((4/5)*(2*y-3)) = 0
(-4/5)*(2*y-3)+6*y = 0
6*y-4/5*(2*y-3) = 0
6*y-4/5*(2*y-3) = 0
22/5*y+12/5 = 0
22/5*y+12/5 = 0
22/5*y+12/5 = 0 // - 12/5
22/5*y = -12/5 // : 22/5
y = -12/5/22/5
y = -6/11
y = -6/11
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