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w in (-oo:+oo)
(1/3)*w+(4/7)*w+1/8 = -1651/168 // + -1651/168
(1/3)*w+(4/7)*w+1/8-(-1651/168) = 0
(1/3)*w+(4/7)*w+1/8+1651/168 = 0
19/21*w+209/21 = 0 // - 209/21
19/21*w = -209/21 // : 19/21
w = -209/21/19/21
w = -11
w = -11
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