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w in (-oo:+oo)
(6/7)*(w-4)-(38/7) = -6 // + 6
(6/7)*(w-4)-(38/7)+6 = 0
(6/7)*(w-4)-38/7+6 = 0
6/7*(w-4)-38/7+6 = 0
(6/7*7*(w-4))/7-38/7+(6*7)/7 = 0
6/7*7*(w-4)+6*7-38 = 0
6*w-62+42 = 0
6*w-20 = 0
(6*w-20)/7 = 0
(6*w-20)/7 = 0 // * 7
6*w-20 = 0
6*w-20 = 0 // + 20
6*w = 20 // : 6
w = 20/6
w = 10/3
w = 10/3
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