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D( a )
a-5 = 0
a-5 = 0
a-5 = 0
a-5 = 0 // + 5
a = 5
a in (-oo:5) U (5:+oo)
(a-2)/(a-5) = -1 // + 1
(a-2)/(a-5)+1 = 0
(a-2)/(a-5)+(1*(a-5))/(a-5) = 0
1*(a-5)+a-2 = 0
2*a-7 = 0
(2*a-7)/(a-5) = 0
(2*a-7)/(a-5) = 0 // * a-5
2*a-7 = 0
2*a-7 = 0 // + 7
2*a = 7 // : 2
a = 7/2
a = 7/2
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