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w in (-oo:+oo)
6*w+8 = 80/7 // - 80/7
6*w-(80/7)+8 = 0
6*w-80/7+8 = 0
6*w-24/7 = 0 // + 24/7
6*w = 24/7 // : 6
w = 24/7/6
w = 4/7
w = 4/7
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