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y in (-oo:+oo)
4/5-((2*y)/5) = 6/5 // - 6/5
4/5-((2*y)/5)-(6/5) = 0
(-2/5)*y+4/5-6/5 = 0
-2/5*y-2/5 = 0 // + 2/5
-2/5*y = 2/5 // : -2/5
y = 2/5/(-2/5)
y = -1
y = -1
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