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w in (-oo:+oo)
9*(w-(1/7)) = 62 // - 62
9*(w-(1/7))-62 = 0
9*(w-1/7)-62 = 0
9*(w-1/7)-62 = 0
9*w-443/7 = 0
9*w-443/7 = 0
9*w-443/7 = 0 // + 443/7
9*w = 443/7 // : 9
w = 443/7/9
w = 443/63
w = 443/63
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