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w in (-oo:+oo)
6*w+7/10 = 607/10 // - 607/10
6*w+7/10-(607/10) = 0
6*w+7/10-607/10 = 0
6*w-60 = 0 // + 60
6*w = 60 // : 6
w = 60/6
w = 10
w = 10
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