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y in (-oo:+oo)
3^1-(2*y) = 1/27 // - 1/27
3^1-(2*y)-(1/27) = 0
3-2*y-1/27 = 0
80/27-2*y = 0 // - 80/27
-2*y = -80/27 // : -2
y = -80/27/(-2)
y = 40/27
y = 40/27
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