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w in (-oo:+oo)
(w+4)/7-((w-4)/25) = 1 // - 1
(w+4)/7-((w-4)/25)-1 = 0
(w+4)/7+(-1*(w-4))/25-1 = 0
(25*(w+4))/(7*25)+(-1*7*(w-4))/(7*25)+(-1*7*25)/(7*25) = 0
25*(w+4)-1*7*(w-4)-1*7*25 = 0
18*w-175+128 = 0
18*w-47 = 0
(18*w-47)/(7*25) = 0
(18*w-47)/(7*25) = 0 // * 7*25
18*w-47 = 0
18*w-47 = 0 // + 47
18*w = 47 // : 18
w = 47/18
w = 47/18
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