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x in (-oo:+oo)
((1/12)*x+1)*((1/12)*x+1) = x+1 // - x+1
((1/12)*x+1)*((1/12)*x+1)-x-1 = 0
(1/12*x+1)^2-x-1 = 0
(1/12*x+1)^2-x-1 = 0
1/144*x^2-5/6*x-1+1 = 0
1/144*x^2-5/6*x = 0
1/144*x^2-5/6*x = 0
1/6*x*(1/24*x-5) = 0
1/24*x-5 = 0 // + 5
1/24*x = 5 // : 1/24
x = 5/1/24
x = 120
1/6*x*(x-120) = 0
1/6*x*(x-120) = 0
( 1/6*x )
1/6*x = 0 // : 1/6
x = 0
( x-120 )
x-120 = 0 // + 120
x = 120
x in { 0, 120 }
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