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x in (-oo:+oo)
X+(7/5)*x^2+39*x+30 = 0
X+7/5*x^2+39*x+30 = 0
DELTA = 39^2-(7/5*4*(X+30))
DELTA = 1521-28/5*(X+30)
1521-28/5*(X+30) = 0
1521-28/5*(X+30) = 0
1353-28/5*X = 0
1353-28/5*X = 0
1353-28/5*X = 0 // - 1353
-28/5*X = -1353 // : -28/5
X = -1353/(-28/5)
X = 6765/28
DELTA = 0 <=> t_1 = 6765/28
x = -39/(7/5*2) i X = 6765/28
x = -195/14 i X = 6765/28
( x = ((1521-28/5*(X+30))^(1/2)-39)/(7/5*2) or x = (-(1521-28/5*(X+30))^(1/2)-39)/(7/5*2) ) i X > 6765/28
( x = 5/14*((1521-28/5*(X+30))^(1/2)-39) or x = -5/14*((1521-28/5*(X+30))^(1/2)+39) ) i X > 6765/28
X-6765/28 > 0
X-6765/28 > 0 // + 6765/28
X > 6765/28
x in { -195/14, 5/14*((1521-28/5*(X+30))^(1/2)-39), -5/14*((1521-28/5*(X+30))^(1/2)+39) }
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