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w in (-oo:+oo)
116 = -7*w-(6*w)-1 // + -7*w-(6*w)-1
6*w-(-7*w)+1+116 = 0
7*w+6*w+1+116 = 0
13*w+117 = 0 // - 117
13*w = -117 // : 13
w = -117/13
w = -9
w = -9
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