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