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w in (-oo:+oo)
6/7 = -4*w // + -4*w
6/7-(-4*w) = 0
4*w+6/7 = 0
4*w+6/7 = 0 // - 6/7
4*w = -6/7 // : 4
w = -6/7/4
w = -3/14
w = -3/14
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