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w in (-oo:+oo)
14/21 = w/15 // - w/15
14/21-(w/15) = 0
2/3-1/15*w = 0 // - 2/3
-1/15*w = -2/3 // : -1/15
w = -2/3/(-1/15)
w = 10
w = 10
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