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w in (-oo:+oo)
(2/3)*w-(2/7) = w-62/21 // - w-62/21
(2/3)*w-w-(2/7)-(-62/21) = 0
(2/3)*w-w-2/7+62/21 = 0
8/3-1/3*w = 0 // - 8/3
-1/3*w = -8/3 // : -1/3
w = -8/3/(-1/3)
w = 8
w = 8
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