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(x-7)/12-((x-5)/5)+1 = 0
(x-7)/12+(-1*(x-5))/5+1 = 0
(5*(x-7))/(5*12)+(-1*12*(x-5))/(5*12)+(1*5*12)/(5*12) = 0
5*(x-7)-1*12*(x-5)+1*5*12 = 0
25-7*x+60 = 0
85-7*x = 0
(85-7*x)/(5*12) = 0
(85-7*x)/(5*12) = 0 // * 5*12
85-7*x = 0
85-7*x = 0 // - 85
-7*x = -85 // : -7
x = -85/(-7)
x = 85/7
x = 85/7
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