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w in (-oo:+oo)
7*w+7/3 = 9*w-(4/4)+4 // - 9*w-(4/4)+4
7*w-(9*w)+7/3+4/4-4 = 0
7*w-9*w+7/3+4/4-4 = 0
-2*w-2/3 = 0 // + 2/3
-2*w = 2/3 // : -2
w = 2/3/(-2)
w = -1/3
w = -1/3
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