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z in (-oo:+oo)
1/7-(z*((3*z-7)/5)) = 0
(-1*z*(3*z-7))/5+1/7 = 0
(-1*7*z*(3*z-7))/(5*7)+(1*5)/(5*7) = 0
1*5-1*7*z*(3*z-7) = 0
49*z-21*z^2+5 = 0
49*z-21*z^2+5 = 0
49*z-21*z^2+5 = 0
DELTA = 49^2-(-21*4*5)
DELTA = 2821
DELTA > 0
z = (2821^(1/2)-49)/(-21*2) or z = (-2821^(1/2)-49)/(-21*2)
z = (2821^(1/2)-49)/(-42) or z = (2821^(1/2)+49)/42
(z-((2821^(1/2)-49)/(-42)))*(z-((2821^(1/2)+49)/42)) = 0
((z-((2821^(1/2)-49)/(-42)))*(z-((2821^(1/2)+49)/42)))/(5*7) = 0
((z-((2821^(1/2)-49)/(-42)))*(z-((2821^(1/2)+49)/42)))/(5*7) = 0 // * 5*7
(z-((2821^(1/2)-49)/(-42)))*(z-((2821^(1/2)+49)/42)) = 0
( z-((2821^(1/2)+49)/42) )
z-((2821^(1/2)+49)/42) = 0 // + (2821^(1/2)+49)/42
z = (2821^(1/2)+49)/42
( z-((2821^(1/2)-49)/(-42)) )
z-((2821^(1/2)-49)/(-42)) = 0 // + (2821^(1/2)-49)/(-42)
z = (2821^(1/2)-49)/(-42)
z in { (2821^(1/2)+49)/42, (2821^(1/2)-49)/(-42) }
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