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