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x in (-oo:+oo)
t_1 = 4*y^-1-y
t_1+5/7*x^2-7*x = 0
t_1+5/7*x^2-7*x = 0
DELTA = (-7)^2-(5/7*4*t_1)
DELTA = 49-20/7*t_1
49-20/7*t_1 = 0
49-20/7*t_1 = 0 // - 49
-20/7*t_1 = -49 // : -20/7
t_1 = -49/(-20/7)
t_1 = 343/20
DELTA = 0 <=> t_2 = 343/20
x = 7/(5/7*2) i t_1 = 343/20
x = 49/10 i t_1 = 343/20
( x = ((49-20/7*t_1)^(1/2)+7)/(5/7*2) or x = (7-(49-20/7*t_1)^(1/2))/(5/7*2) ) i t_1 > 343/20
( x = 7/10*((49-20/7*t_1)^(1/2)+7) or x = 7/10*(7-(49-20/7*t_1)^(1/2)) ) i t_1 > 343/20
t_1-343/20 > 0
t_1-343/20 > 0 // + 343/20
t_1 > 343/20
x in { 49/10, 7/10*((49-20/7*(4*y^-1-y))^(1/2)+7), 7/10*(7-(49-20/7*(4*y^-1-y))^(1/2)) }
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