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w in (-oo:+oo)
5*w+6*w+5 = 19/6 // - 19/6
5*w+6*w-(19/6)+5 = 0
5*w+6*w-19/6+5 = 0
11*w+11/6 = 0 // - 11/6
11*w = -11/6 // : 11
w = -11/6/11
w = -1/6
w = -1/6
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