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w in (-oo:+oo)
3-((5/7)*w) = 47/14 // - 47/14
3-((5/7)*w)-(47/14) = 0
(-5/7)*w-47/14+3 = 0
-5/7*w-5/14 = 0 // + 5/14
-5/7*w = 5/14 // : -5/7
w = 5/14/(-5/7)
w = -1/2
w = -1/2
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