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D( a )
a^2+3*a+2 = 0
a^2+3*a+2 = 0
a^2+3*a+2 = 0
a^2+3*a+2 = 0
DELTA = 3^2-(1*2*4)
DELTA = 1
DELTA > 0
a = (1^(1/2)-3)/(1*2) or a = (-1^(1/2)-3)/(1*2)
a = -1 or a = -2
a in (-oo:-2) U (-2:-1) U (-1:+oo)
(7*a-2)/(a^2+3*a+2)-((5*a-6)/(a^2+3*a+2)) = (12*a-8)/(a^2+3*a+2) // - (12*a-8)/(a^2+3*a+2)
(7*a-2)/(a^2+3*a+2)-((5*a-6)/(a^2+3*a+2))-((12*a-8)/(a^2+3*a+2)) = 0
(7*a-2)/(a^2+3*a+2)+(-1*(5*a-6))/(a^2+3*a+2)+(-1*(12*a-8))/(a^2+3*a+2) = 0
a^2+3*a+2 = 0
a^2+3*a+2 = 0
a^2+3*a+2 = 0
DELTA = 3^2-(1*2*4)
DELTA = 1
DELTA > 0
a = (1^(1/2)-3)/(1*2) or a = (-1^(1/2)-3)/(1*2)
a = -1 or a = -2
(a+2)*(a+1) = 0
(7*a-2)/((a+2)*(a+1))+(-1*(5*a-6))/((a+2)*(a+1))+(-1*(12*a-8))/((a+2)*(a+1)) = 0
7*a-1*(5*a-6)-1*(12*a-8)-2 = 0
2*a-12*a+4+8 = 0
12-10*a = 0
(12-10*a)/((a+2)*(a+1)) = 0
(12-10*a)/((a+2)*(a+1)) = 0 // * (a+2)*(a+1)
12-10*a = 0
12-10*a = 0 // - 12
-10*a = -12 // : -10
a = -12/(-10)
a = 6/5
a = 6/5
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