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w in (-oo:+oo)
6*w+3*w-(6*w)+1/7 = 0
6*w+3*w-6*w+1/7 = 0
3*w+1/7 = 0 // - 1/7
3*w = -1/7 // : 3
w = -1/7/3
w = -1/21
w = -1/21
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