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w in (-oo:+oo)
7*w+5 = 6*w+21/4 // - 6*w+21/4
7*w-(6*w)-(21/4)+5 = 0
7*w-6*w-21/4+5 = 0
w-1/4 = 0 // + 1/4
w = 1/4
w = 1/4
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