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