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w in (-oo:+oo)
7*w+7 = 28/3 // - 28/3
7*w-(28/3)+7 = 0
7*w-28/3+7 = 0
7*w-7/3 = 0 // + 7/3
7*w = 7/3 // : 7
w = 7/3/7
w = 1/3
w = 1/3
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