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y in (-oo:+oo)
1/2-((1/3)*y)-(4/9) = 0
(-1/3)*y+1/2-4/9 = 0
1/18-1/3*y = 0 // - 1/18
-1/3*y = -1/18 // : -1/3
y = -1/18/(-1/3)
y = 1/6
y = 1/6
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