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w in (-oo:+oo)
2/9-6*w = (6/7)*w+4334/63 // - (6/7)*w+4334/63
2/9-6*w-((6/7)*w)-(4334/63) = 0
(-6/7)*w-6*w+2/9-4334/63 = 0
-48/7*w-480/7 = 0 // + 480/7
-48/7*w = 480/7 // : -48/7
w = 480/7/(-48/7)
w = -10
w = -10
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