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w in (-oo:+oo)
(w-7)/7 = 22-((5*w+9)/2) // - 22-((5*w+9)/2)
(w-7)/7+(5*w+9)/2-22 = 0
(2*(w-7))/(2*7)+(7*(5*w+9))/(2*7)+(-22*2*7)/(2*7) = 0
2*(w-7)+7*(5*w+9)-22*2*7 = 0
37*w-308+49 = 0
37*w-259 = 0
(37*w-259)/(2*7) = 0
(37*w-259)/(2*7) = 0 // * 2*7
37*w-259 = 0
37*w-259 = 0 // + 259
37*w = 259 // : 37
w = 259/37
w = 7
w = 7
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