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w in (-oo:+oo)
(2/3)*w = (1/3)*w-3 // - (1/3)*w-3
(2/3)*w-((1/3)*w)+3 = 0
(2/3)*w+(-1/3)*w+3 = 0
1/3*w+3 = 0 // - 3
1/3*w = -3 // : 1/3
w = -3/1/3
w = -9
w = -9
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