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