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x in (-oo:+oo)
110 = (x*(2*x+2))/2 // - (x*(2*x+2))/2
110-((x*(2*x+2))/2) = 0
(-1*x*(2*x+2))/2+110 = 0
(-1*x*(2*x+2))/2+(2*110)/2 = 0
2*110-1*x*(2*x+2) = 0
220-2*x^2-2*x = 0
220-2*x^2-2*x = 0
2*(110-x^2-x) = 0
110-x^2-x = 0
DELTA = (-1)^2-(-1*4*110)
DELTA = 441
DELTA > 0
x = (441^(1/2)+1)/(-1*2) or x = (1-441^(1/2))/(-1*2)
x = -11 or x = 10
2*(x+11)*(x-10) = 0
(2*(x+11)*(x-10))/2 = 0
(2*(x+11)*(x-10))/2 = 0 // * 2
2*(x+11)*(x-10) = 0
( x+11 )
x+11 = 0 // - 11
x = -11
( x-10 )
x-10 = 0 // + 10
x = 10
x in { -11, 10 }
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