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w in (-oo:+oo)
(-1/2)*w+2/7 = -1/3 // + -1/3
(-1/2)*w+2/7-(-1/3) = 0
(-1/2)*w+2/7+1/3 = 0
13/21-1/2*w = 0 // - 13/21
-1/2*w = -13/21 // : -1/2
w = -13/21/(-1/2)
w = 26/21
w = 26/21
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