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w in (-oo:+oo)
5-((1/2)*w) = 13 // - 13
5-((1/2)*w)-13 = 0
(-1/2)*w-13+5 = 0
-1/2*w-8 = 0 // + 8
-1/2*w = 8 // : -1/2
w = 8/(-1/2)
w = -16
w = -16
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