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((1/2)*x+5)^2 = 12 // - 12
((1/2)*x+5)^2-12 = 0
(1/2*x+5)^2-12 = 0
(1/2*x+5)^2-12 = 0
1/4*x^2+5*x+13 = 0
1/4*x^2+5*x+13 = 0
1/4*x^2+5*x+13 = 0
DELTA = 5^2-(1/4*4*13)
DELTA = 12
DELTA > 0
x = (12^(1/2)-5)/(1/4*2) or x = (-12^(1/2)-5)/(1/4*2)
x = 2*(2*3^(1/2)-5) or x = 2*(-2*3^(1/2)-5)
(x-2*(-2*3^(1/2)-5))*(x-2*(2*3^(1/2)-5)) = 0
(x-2*(-2*3^(1/2)-5))*(x-2*(2*3^(1/2)-5)) = 0
( x-2*(-2*3^(1/2)-5) )
x-2*(-2*3^(1/2)-5) = 0 // + -2*(-2*3^(1/2)-5)
x = -(-2*(-2*3^(1/2)-5))
x = 2*(-2*3^(1/2)-5)
( x-2*(2*3^(1/2)-5) )
x-2*(2*3^(1/2)-5) = 0 // + -2*(2*3^(1/2)-5)
x = -(-2*(2*3^(1/2)-5))
x = 2*(2*3^(1/2)-5)
x in { 2*(-2*3^(1/2)-5), 2*(2*3^(1/2)-5) }
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