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w in (-oo:+oo)
-((2/3)*w)-2/9 = -38/63 // + -38/63
-((2/3)*w)-2/9-(-38/63) = 0
(-2/3)*w-2/9+38/63 = 0
8/21-2/3*w = 0 // - 8/21
-2/3*w = -8/21 // : -2/3
w = -8/21/(-2/3)
w = 4/7
w = 4/7
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