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w in (-oo:+oo)
6*w-3/7 = -3 // + 3
6*w-3/7+3 = 0
6*w+18/7 = 0 // - 18/7
6*w = -18/7 // : 6
w = -18/7/6
w = -3/7
w = -3/7
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