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((x+1)^2)/3-(((9*x+1)^1)/3) = 0
((x+1)^2)/3-((9*x+1)/3) = 0
((x+1)^2)/3+(-1*(9*x+1))/3 = 0
(x+1)^2-1*(9*x+1) = 0
x^2-7*x = 0
x^2-7*x = 0
x*(x-7) = 0
x-7 = 0 // + 7
x = 7
x*(x-7) = 0
(x*(x-7))/3 = 0
(x*(x-7))/3 = 0 // * 3
x*(x-7) = 0
( x-7 )
x-7 = 0 // + 7
x = 7
( x )
x = 0
x in { 7, 0 }
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