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w in (-oo:+oo)
11.2 = w/7 // - w/7
11.2-(w/7) = 0
11.2-1/7*w = 0 // - 11.2
-1/7*w = -11.2 // : -1/7
w = -11.2/(-1/7)
w = 78.40000157
w = 78.40000157
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