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x in (-oo:+oo)
((2*x)/2)*x+x = 99 // - 99
((2*x)/2)*x+x-99 = 0
x^2+x-99 = 0
DELTA = 1^2-(-99*1*4)
DELTA = 397
DELTA > 0
x = (397^(1/2)-1)/(1*2) or x = (-397^(1/2)-1)/(1*2)
x = (397^(1/2)-1)/2 or x = (-(397^(1/2)+1))/2
x in { (-(397^(1/2)+1))/2, (397^(1/2)-1)/2 }
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