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w in (-oo:+oo)
7*w+7 = 49/4 // - 49/4
7*w-(49/4)+7 = 0
7*w-49/4+7 = 0
7*w-21/4 = 0 // + 21/4
7*w = 21/4 // : 7
w = 21/4/7
w = 3/4
w = 3/4
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