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y in (-oo:+oo)
1-((2/3)*y) = 9/5-(y/5)+3/5 // - 9/5-(y/5)+3/5
y/5-((2/3)*y)-(9/5)-(3/5)+1 = 0
(-2/3)*y+y/5-9/5-3/5+1 = 0
-7/15*y-7/5 = 0 // + 7/5
-7/15*y = 7/5 // : -7/15
y = 7/5/(-7/15)
y = -3
y = -3
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