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w in (-oo:+oo)
w-1 = 3*w+13 // - 3*w+13
w-(3*w)-13-1 = 0
w-3*w-13-1 = 0
-2*w-14 = 0 // + 14
-2*w = 14 // : -2
w = 14/(-2)
w = -7
w = -7
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