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x in (-oo:+oo)
(7*x+1)/5 = (-x)^2 // - (-x)^2
(7*x+1)/5-(-x)^2 = 0
(7*x+1)/5-x^2 = 0
(7*x+1)/5+(5*(-x^2))/5 = 0
5*(-x^2)+7*x+1 = 0
7*x-5*x^2+1 = 0
7*x-5*x^2+1 = 0
7*x-5*x^2+1 = 0
DELTA = 7^2-(-5*1*4)
DELTA = 69
DELTA > 0
x = (69^(1/2)-7)/(-5*2) or x = (-69^(1/2)-7)/(-5*2)
x = (69^(1/2)-7)/(-10) or x = (69^(1/2)+7)/10
(x-((69^(1/2)-7)/(-10)))*(x-((69^(1/2)+7)/10)) = 0
((x-((69^(1/2)-7)/(-10)))*(x-((69^(1/2)+7)/10)))/5 = 0
((x-((69^(1/2)-7)/(-10)))*(x-((69^(1/2)+7)/10)))/5 = 0 // * 5
(x-((69^(1/2)-7)/(-10)))*(x-((69^(1/2)+7)/10)) = 0
( x-((69^(1/2)+7)/10) )
x-((69^(1/2)+7)/10) = 0 // + (69^(1/2)+7)/10
x = (69^(1/2)+7)/10
( x-((69^(1/2)-7)/(-10)) )
x-((69^(1/2)-7)/(-10)) = 0 // + (69^(1/2)-7)/(-10)
x = (69^(1/2)-7)/(-10)
x in { (69^(1/2)+7)/10, (69^(1/2)-7)/(-10) }
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