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w in (-oo:+oo)
13 = 5*w-(4*w)+5 // - 5*w-(4*w)+5
4*w-(5*w)-5+13 = 0
4*w-5*w-5+13 = 0
8-w = 0 // - 8
-w = -8 // * -1
w = 8
w = 8
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