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