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