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w in (-oo:+oo)
w-((6/7)*w)-9 = -317/35 // + -317/35
w-((6/7)*w)-(-317/35)-9 = 0
w+(-6/7)*w+317/35-9 = 0
1/7*w+2/35 = 0 // - 2/35
1/7*w = -2/35 // : 1/7
w = -2/35/1/7
w = -2/5
w = -2/5
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