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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)
(-3*a)/(a+3) = 6/(a-7) // - 6/(a-7)
(-3*a)/(a+3)-(6/(a-7)) = 0
(-3*a)/(a+3)-6*(a-7)^-1 = 0
(-3*a)/(a+3)-6/(a-7) = 0
(-3*a*(a-7))/((a+3)*(a-7))+(-6*(a+3))/((a+3)*(a-7)) = 0
-3*a*(a-7)-6*(a+3) = 0
15*a-3*a^2-18 = 0
15*a-3*a^2-18 = 0
3*(5*a-a^2-6) = 0
5*a-a^2-6 = 0
DELTA = 5^2-(-6*(-1)*4)
DELTA = 1
DELTA > 0
a = (1^(1/2)-5)/(-1*2) or a = (-1^(1/2)-5)/(-1*2)
a = 2 or a = 3
3*(a-2)*(a-3) = 0
(3*(a-2)*(a-3))/((a+3)*(a-7)) = 0
(3*(a-2)*(a-3))/((a+3)*(a-7)) = 0 // * (a+3)*(a-7)
3*(a-2)*(a-3) = 0
( a-2 )
a-2 = 0 // + 2
a = 2
( a-3 )
a-3 = 0 // + 3
a = 3
a in { 2, 3 }
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