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D( a )
a-7 = 0
a-3 = 0
a-7 = 0
a-7 = 0
a-7 = 0 // + 7
a = 7
a-3 = 0
a-3 = 0
a-3 = 0 // + 3
a = 3
a in (-oo:3) U (3:7) U (7:+oo)
4/(a-7) = (-2*a)/(a-3) // - (-2*a)/(a-3)
4/(a-7)-((-2*a)/(a-3)) = 0
4/(a-7)+2*a*(a-3)^-1 = 0
4/(a-7)+(2*a)/(a-3) = 0
(4*(a-3))/((a-7)*(a-3))+(2*a*(a-7))/((a-7)*(a-3)) = 0
4*(a-3)+2*a*(a-7) = 0
2*a^2-10*a-12 = 0
2*a^2-10*a-12 = 0
2*(a^2-5*a-6) = 0
a^2-5*a-6 = 0
DELTA = (-5)^2-(-6*1*4)
DELTA = 49
DELTA > 0
a = (49^(1/2)+5)/(1*2) or a = (5-49^(1/2))/(1*2)
a = 6 or a = -1
2*(a+1)*(a-6) = 0
(2*(a+1)*(a-6))/((a-7)*(a-3)) = 0
(2*(a+1)*(a-6))/((a-7)*(a-3)) = 0 // * (a-7)*(a-3)
2*(a+1)*(a-6) = 0
( a+1 )
a+1 = 0 // - 1
a = -1
( a-6 )
a-6 = 0 // + 6
a = 6
a in { -1, 6 }
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