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w in (-oo:+oo)
42 = (6/7)*w // - (6/7)*w
42-((6/7)*w) = 0
(-6/7)*w+42 = 0
42-6/7*w = 0 // - 42
-6/7*w = -42 // : -6/7
w = -42/(-6/7)
w = 49
w = 49
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