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w in (-oo:+oo)
(1/2)*w+2/3 = 13/42 // - 13/42
(1/2)*w+2/3-(13/42) = 0
(1/2)*w+2/3-13/42 = 0
1/2*w+5/14 = 0 // - 5/14
1/2*w = -5/14 // : 1/2
w = -5/14/1/2
w = -5/7
w = -5/7
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