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w in (-oo:+oo)
7 = w/17.5 // - w/17.5
7-(w/17.5) = 0
7-0.05714286*w = 0
7-0.05714286*w = 0 // - 7
-0.05714286*w = -7 // : -0.05714286
w = -7/(-0.05714286)
w = 122.49999388
w = 122.49999388
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