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x in (-oo:+oo)
(x/11)*x-(66*(x^2-((6*x)/7))) = 0
(x/11)*x-66*(x^2+(-6/7)*x) = 0
(x^2)/11-66*(x^2-6/7*x) = 0
(-66*11*(x^2-6/7*x))/11+(x^2)/11 = 0
x^2-66*11*(x^2-6/7*x) = 0
4356/7*x-725*x^2 = 0
4356/7*x-725*x^2 = 0
x*(4356/7-725*x) = 0
4356/7-725*x = 0 // - 4356/7
-725*x = -4356/7 // : -725
x = -4356/7/(-725)
x = 4356/5075
x*(x-4356/5075) = 0
(x*(x-4356/5075))/11 = 0
(x*(x-4356/5075))/11 = 0 // * 11
x*(x-4356/5075) = 0
( x-4356/5075 )
x-4356/5075 = 0 // + 4356/5075
x = 4356/5075
( x )
x = 0
x in { 4356/5075, 0 }
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