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x in (-oo:+oo)
x-(7*x^2)-(y/5) = -9 // + 9
x-(7*x^2)-(y/5)+9 = 0
x-7*x^2-(y/5)+9 = 0
x-7*x^2-1/5*y+9 = 0
DELTA = 1^2-(-7*4*(9-1/5*y))
DELTA = 28*(9-1/5*y)+1
28*(9-1/5*y)+1 = 0
28*(9-1/5*y)+1 = 0
253-28/5*y = 0
253-28/5*y = 0
253-28/5*y = 0 // - 253
-28/5*y = -253 // : -28/5
y = -253/(-28/5)
y = 1265/28
DELTA = 0 <=> t_1 = 1265/28
x = -1/(-7*2) i y = 1265/28
x = 1/14 i y = 1265/28
( x = ((28*(9-1/5*y)+1)^(1/2)-1)/(-7*2) or x = (-(28*(9-1/5*y)+1)^(1/2)-1)/(-7*2) ) i y > 1265/28
( x = ((28*(9-1/5*y)+1)^(1/2)-1)/(-14) or x = ((28*(9-1/5*y)+1)^(1/2)+1)/14 ) i y > 1265/28
y-1265/28 > 0
y-1265/28 > 0 // + 1265/28
y > 1265/28
x in { 1/14, ((28*(9-1/5*y)+1)^(1/2)-1)/(-14), ((28*(9-1/5*y)+1)^(1/2)+1)/14 }
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