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w in (-oo:+oo)
(6/7)*w+3/4 = -3/28 // + -3/28
(6/7)*w+3/4-(-3/28) = 0
(6/7)*w+3/4+3/28 = 0
6/7*w+6/7 = 0 // - 6/7
6/7*w = -6/7 // : 6/7
w = -6/7/6/7
w = -1
w = -1
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