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x in (-oo:+oo)
(x-1)/6 = (x-1)/5 // - (x-1)/5
(x-1)/6-((x-1)/5) = 0
(x-1)/6+(-1*(x-1))/5 = 0
(5*(x-1))/(5*6)+(-1*6*(x-1))/(5*6) = 0
5*(x-1)-1*6*(x-1) = 0
1-x = 0
(1-x)/(5*6) = 0
(1-x)/(5*6) = 0 // * 5*6
1-x = 0
1-x = 0 // - 1
-x = -1 // * -1
x = 1
x = 1
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