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w in (-oo:+oo)
(2/7)*w = -1/6 // + -1/6
(2/7)*w-(-1/6) = 0
(2/7)*w+1/6 = 0
2/7*w+1/6 = 0 // - 1/6
2/7*w = -1/6 // : 2/7
w = -1/6/2/7
w = -7/12
w = -7/12
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