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y in (-oo:+oo)
1-((2/3)*y) = 6/15 // - 6/15
1-((2/3)*y)-(6/15) = 0
(-2/3)*y-2/5+1 = 0
3/5-2/3*y = 0 // - 3/5
-2/3*y = -3/5 // : -2/3
y = -3/5/(-2/3)
y = 9/10
y = 9/10
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