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w in (-oo:+oo)
6 = (2/7)*w // - (2/7)*w
6-((2/7)*w) = 0
(-2/7)*w+6 = 0
6-2/7*w = 0 // - 6
-2/7*w = -6 // : -2/7
w = -6/(-2/7)
w = 21
w = 21
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