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w in (-oo:+oo)
42 = (3/7)*w // - (3/7)*w
42-((3/7)*w) = 0
(-3/7)*w+42 = 0
42-3/7*w = 0 // - 42
-3/7*w = -42 // : -3/7
w = -42/(-3/7)
w = 98
w = 98
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