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D( a )
2*a+8 = 0
a+4 = 0
2*a+8 = 0
2*a+8 = 0
2*a+8 = 0 // - 8
2*a = -8 // : 2
a = -8/2
a = -4
a+4 = 0
a+4 = 0
a+4 = 0 // - 4
a = -4
a in (-oo:-4) U (-4:+oo)
(a+7)/(a+4)-1 = (a+10)/(2*a+8) // - (a+10)/(2*a+8)
(a+7)/(a+4)-((a+10)/(2*a+8))-1 = 0
(a+7)/(a+4)+(-1*(a+10))/(2*a+8)-1 = 0
((a+7)*(2*a+8))/((a+4)*(2*a+8))+(-1*(a+10)*(a+4))/((a+4)*(2*a+8))+(-1*(a+4)*(2*a+8))/((a+4)*(2*a+8)) = 0
(a+7)*(2*a+8)-1*(a+10)*(a+4)-1*(a+4)*(2*a+8) = 0
a^2-2*a^2+8*a-16*a-32+16 = 0
-a^2-8*a-16 = 0
-a^2-8*a-16 = 0
-1*(a^2+8*a+16) = 0
a^2+8*a+16 = 0
DELTA = 8^2-(1*4*16)
DELTA = 0
a = -8/(1*2)
a = -4 or a = -4
-1*(a+4)^2 = 0
(-1*(a+4)^2)/((a+4)*(2*a+8)) = 0
(-1*(a+4)^2)/((a+4)*(2*a+8)) = 0 // * (a+4)*(2*a+8)
-1*(a+4)^2 = 0
a+4 = 0 // - 4
a = -4
a in { -4}
a belongs to the empty set
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