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w in (-oo:+oo)
14*w+5/(-3) = -7 // + 7
14*w+5/(-3)+7 = 0
14*w+16/3 = 0 // - 16/3
14*w = -16/3 // : 14
w = -16/3/14
w = -8/21
w = -8/21
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