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w in (-oo:+oo)
(2/3)*w+(1/2)*w+1/7 = -37/84 // + -37/84
(2/3)*w+(1/2)*w+1/7-(-37/84) = 0
(2/3)*w+(1/2)*w+1/7+37/84 = 0
7/6*w+7/12 = 0 // - 7/12
7/6*w = -7/12 // : 7/6
w = -7/12/7/6
w = -1/2
w = -1/2
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