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w in (-oo:+oo)
12/7 = -4*w // + -4*w
12/7-(-4*w) = 0
4*w+12/7 = 0
4*w+12/7 = 0 // - 12/7
4*w = -12/7 // : 4
w = -12/7/4
w = -3/7
w = -3/7
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