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w in (-oo:+oo)
13 = 5*w+w-5 // - 5*w+w-5
5-(5*w)-w+13 = 0
5-5*w-w+13 = 0
18-6*w = 0 // - 18
-6*w = -18 // : -6
w = -18/(-6)
w = 3
w = 3
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