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w in (-oo:+oo)
(6/7)*w-9 = -51/7 // + -51/7
(6/7)*w-(-51/7)-9 = 0
(6/7)*w+51/7-9 = 0
6/7*w-12/7 = 0 // + 12/7
6/7*w = 12/7 // : 6/7
w = 12/7/6/7
w = 2
w = 2
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