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w in (-oo:+oo)
17.5/2 = w/9 // - w/9
17.5/2-(w/9) = 0
8.75-1/9*w = 0 // - 8.75
-1/9*w = -8.75 // : -1/9
w = -8.75/(-1/9)
w = 78.75000079
w = 78.75000079
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