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w in (-oo:+oo)
6/8 = w/100 // - w/100
6/8-(w/100) = 0
3/4-1/100*w = 0 // - 3/4
-1/100*w = -3/4 // : -1/100
w = -3/4/(-1/100)
w = 75
w = 75
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