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x in (-oo:+oo)
x*((7-x)/5) = y // - y
x*((7-x)/5)-y = 0
(x*(7-x))/5-y = 0
(x*(7-x))/5+(5*(-y))/5 = 0
x*(7-x)+5*(-y) = 0
7*x-x^2-5*y = 0
(7*x-x^2-5*y)/5 = 0
(7*x-x^2-5*y)/5 = 0 // * 5
7*x-x^2-5*y = 0
7*x-x^2-5*y = 0
DELTA = 7^2-(-5*(-1)*4*y)
DELTA = 49-20*y
49-20*y = 0
49-20*y = 0 // - 49
-20*y = -49 // : -20
y = -49/(-20)
y = 49/20
DELTA = 0 <=> t_3 = 49/20
x = -7/(-1*2) i y = 49/20
x = 7/2 i y = 49/20
( x = ((49-20*y)^(1/2)-7)/(-1*2) or x = (-(49-20*y)^(1/2)-7)/(-1*2) ) i y > 49/20
( x = ((49-20*y)^(1/2)-7)/(-2) or x = ((49-20*y)^(1/2)+7)/2 ) i y > 49/20
y-49/20 > 0
y-49/20 > 0 // + 49/20
y > 49/20
x in { 7/2, ((49-20*y)^(1/2)-7)/(-2), ((49-20*y)^(1/2)+7)/2 }
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