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D( a )
3*a+2 = 0
3*a+2 = 0
3*a+2 = 0
3*a+2 = 0 // - 2
3*a = -2 // : 3
a = -2/3
a in (-oo:-2/3) U (-2/3:+oo)
(a-3)/(3*a+2) = 1/5 // - 1/5
(a-3)/(3*a+2)-(1/5) = 0
(a-3)/(3*a+2)-1/5 = 0
(5*(a-3))/(5*(3*a+2))+(-1*(3*a+2))/(5*(3*a+2)) = 0
5*(a-3)-1*(3*a+2) = 0
2*a-17 = 0
(2*a-17)/(5*(3*a+2)) = 0
(2*a-17)/(5*(3*a+2)) = 0 // * 5*(3*a+2)
2*a-17 = 0
2*a-17 = 0 // + 17
2*a = 17 // : 2
a = 17/2
a = 17/2
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