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x in (-oo:+oo)
x^2 = (6/11)*x+135/121 // - (6/11)*x+135/121
x^2-((6/11)*x)-(135/121) = 0
x^2+(-6/11)*x-135/121 = 0
x^2-6/11*x-135/121 = 0
DELTA = (-6/11)^2-(-135/121*1*4)
DELTA = 576/121
DELTA > 0
x = ((576/121)^(1/2)+6/11)/(1*2) or x = (6/11-(576/121)^(1/2))/(1*2)
x = 15/11 or x = -9/11
x in { -9/11, 15/11 }
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