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w in (-oo:+oo)
86 = 2*w+7*w+5 // - 2*w+7*w+5
86-(2*w)-(7*w)-5 = 0
86-2*w-7*w-5 = 0
81-9*w = 0 // - 81
-9*w = -81 // : -9
w = -81/(-9)
w = 9
w = 9
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