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w in (-oo:+oo)
2-((6/7)*w) = 122/49 // - 122/49
2-((6/7)*w)-(122/49) = 0
(-6/7)*w-122/49+2 = 0
-6/7*w-24/49 = 0 // + 24/49
-6/7*w = 24/49 // : -6/7
w = 24/49/(-6/7)
w = -4/7
w = -4/7
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