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x in (-oo:+oo)
((1/2)*x-1)^2+(1/2)*x-90-1 = 0
(1/2*x-1)^2+x/2-90-1 = 0
(2*(1/2*x-1)^2)/2+x/2+(-90*2)/2+(-1*2)/2 = 0
2*(1/2*x-1)^2+x-90*2-1*2 = 0
1/2*x^2-x-180-2+2 = 0
1/2*x^2-x-178-2 = 0
1/2*x^2-x-180 = 0
1/2*x^2-x-180 = 0
1/2*x^2-x-180 = 0
DELTA = (-1)^2-(-180*1/2*4)
DELTA = 361
DELTA > 0
x = (361^(1/2)+1)/(1/2*2) or x = (1-361^(1/2))/(1/2*2)
x = 20 or x = -18
(x+18)*(x-20) = 0
((x+18)*(x-20))/2 = 0
((x+18)*(x-20))/2 = 0 // * 2
(x+18)*(x-20) = 0
( x+18 )
x+18 = 0 // - 18
x = -18
( x-20 )
x-20 = 0 // + 20
x = 20
x in { -18, 20 }
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