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w in (-oo:+oo)
109 = 1-7*w-(5*w) // - 1-7*w-(5*w)
5*w-(-7*w)-1+109 = 0
7*w+5*w-1+109 = 0
12*w+108 = 0 // - 108
12*w = -108 // : 12
w = -108/12
w = -9
w = -9
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