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w in (-oo:+oo)
34 = 9-(w/(-2)) // - 9-(w/(-2))
w/(-2)-9+34 = 0
25-1/2*w = 0 // - 25
-1/2*w = -25 // : -1/2
w = -25/(-1/2)
w = 50
w = 50
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