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a in (-oo:+oo)
2*a-(3*a)+5/7 = ((a-1)*(a+1))/7 // - ((a-1)*(a+1))/7
2*a-(((a-1)*(a+1))/7)-(3*a)+5/7 = 0
2*a-(((a-1)*(a+1))/7)-3*a+5/7 = 0
(-1*(a-1)*(a+1))/7+2*a-3*a+5/7 = 0
(-1*(a-1)*(a+1))/7+(2*7*a)/7+(-3*7*a)/7+5/7 = 0
2*7*a-1*(a-1)*(a+1)-3*7*a+5 = 0
14*a-a^2-21*a+1+5 = 0
1-a^2-7*a+5 = 0
6-a^2-7*a = 0
6-a^2-7*a = 0
6-a^2-7*a = 0
DELTA = (-7)^2-(-1*4*6)
DELTA = 73
DELTA > 0
a = (73^(1/2)+7)/(-1*2) or a = (7-73^(1/2))/(-1*2)
a = (73^(1/2)+7)/(-2) or a = (7-73^(1/2))/(-2)
(a-((73^(1/2)+7)/(-2)))*(a-((7-73^(1/2))/(-2))) = 0
((a-((73^(1/2)+7)/(-2)))*(a-((7-73^(1/2))/(-2))))/7 = 0
((a-((73^(1/2)+7)/(-2)))*(a-((7-73^(1/2))/(-2))))/7 = 0 // * 7
(a-((73^(1/2)+7)/(-2)))*(a-((7-73^(1/2))/(-2))) = 0
( a-((7-73^(1/2))/(-2)) )
a-((7-73^(1/2))/(-2)) = 0 // + (7-73^(1/2))/(-2)
a = (7-73^(1/2))/(-2)
( a-((73^(1/2)+7)/(-2)) )
a-((73^(1/2)+7)/(-2)) = 0 // + (73^(1/2)+7)/(-2)
a = (73^(1/2)+7)/(-2)
a in { (7-73^(1/2))/(-2), (73^(1/2)+7)/(-2) }
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