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w in (-oo:+oo)
3/7 = w/28 // - w/28
3/7-(w/28) = 0
3/7-1/28*w = 0 // - 3/7
-1/28*w = -3/7 // : -1/28
w = -3/7/(-1/28)
w = 12
w = 12
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