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x in (-oo:+oo)
x/5-((x+4)/7) = 5 // - 5
x/5-((x+4)/7)-5 = 0
(-1*(x+4))/7+x/5-5 = 0
(-1*5*(x+4))/(5*7)+(7*x)/(5*7)+(-5*5*7)/(5*7) = 0
7*x-1*5*(x+4)-5*5*7 = 0
2*x-175-20 = 0
2*x-195 = 0
(2*x-195)/(5*7) = 0
(2*x-195)/(5*7) = 0 // * 5*7
2*x-195 = 0
2*x-195 = 0 // + 195
2*x = 195 // : 2
x = 195/2
x = 195/2
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