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w in (-oo:+oo)
w/4 = -6/7 // + -6/7
w/4-(-6/7) = 0
w/4+6/7 = 0
1/4*w+6/7 = 0 // - 6/7
1/4*w = -6/7 // : 1/4
w = -6/7/1/4
w = -24/7
w = -24/7
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