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w in (-oo:+oo)
39 = 7*w+w+7 // - 7*w+w+7
39-(7*w)-w-7 = 0
39-7*w-w-7 = 0
32-8*w = 0 // - 32
-8*w = -32 // : -8
w = -32/(-8)
w = 4
w = 4
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