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w in (-oo:+oo)
((7/47)/4)*w-((3/7)*w) = 1/14 // - 1/14
((7/47)/4)*w-((3/7)*w)-(1/14) = 0
((7/47)/4)*w+(-3/7)*w-1/14 = 0
-515/1316*w-1/14 = 0 // + 1/14
-515/1316*w = 1/14 // : -515/1316
w = 1/14/(-515/1316)
w = -94/515
w = -94/515
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