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