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D( a )
a+10 = 0
a-14 = 0
a+10 = 0
a+10 = 0
a+10 = 0 // - 10
a = -10
a-14 = 0
a-14 = 0
a-14 = 0 // + 14
a = 14
a in (-oo:-10) U (-10:14) U (14:+oo)
(-3*a)/(a+10) = 6/(a-14) // - 6/(a-14)
(-3*a)/(a+10)-(6/(a-14)) = 0
(-3*a)/(a+10)-6*(a-14)^-1 = 0
(-3*a)/(a+10)-6/(a-14) = 0
(-3*a*(a-14))/((a+10)*(a-14))+(-6*(a+10))/((a+10)*(a-14)) = 0
-3*a*(a-14)-6*(a+10) = 0
36*a-3*a^2-60 = 0
36*a-3*a^2-60 = 0
3*(12*a-a^2-20) = 0
12*a-a^2-20 = 0
DELTA = 12^2-(-20*(-1)*4)
DELTA = 64
DELTA > 0
a = (64^(1/2)-12)/(-1*2) or a = (-64^(1/2)-12)/(-1*2)
a = 2 or a = 10
3*(a-2)*(a-10) = 0
(3*(a-2)*(a-10))/((a+10)*(a-14)) = 0
(3*(a-2)*(a-10))/((a+10)*(a-14)) = 0 // * (a+10)*(a-14)
3*(a-2)*(a-10) = 0
( a-10 )
a-10 = 0 // + 10
a = 10
( a-2 )
a-2 = 0 // + 2
a = 2
a in { 10, 2 }
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