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x in (-oo:+oo)
t_1 = X^2-2+13/2
t_1-0.5*x^2-5*x-2*x = 0
t_1-0.5*x^2-7*x = 0
DELTA = (-7)^2-(-0.5*4*t_1)
DELTA = 2*t_1+49
2*t_1+49 = 0
2*t_1+49 = 0 // - 49
2*t_1 = -49 // : 2
t_1 = -49/2
DELTA = 0 <=> t_2 = -49/2
x = 7/(-0.5*2) i t_1 = -49/2
x = -7 i t_1 = -49/2
( x = ((2*t_1+49)^(1/2)+7)/(-0.5*2) or x = (7-(2*t_1+49)^(1/2))/(-0.5*2) ) i t_1 > -49/2
( x = -((2*t_1+49)^(1/2)+7) or x = (2*t_1+49)^(1/2)-7 ) i t_1 > -49/2
t_1-(-49/2) > 0
t_1+49/2 > 0
t_1+49/2 > 0 // - 49/2
t_1 > -49/2
x in { -7, -((2*(X^2-2+13/2)+49)^(1/2)+7), (2*(X^2-2+13/2)+49)^(1/2)-7 }
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