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D( a )
9*a+14 = 0
9*a+14 = 0
9*a+14 = 0
9*a+14 = 0 // - 14
9*a = -14 // : 9
a = -14/9
a in (-oo:-14/9) U (-14/9:+oo)
(7*a+10)/(9*a+14) = 0
7*a+10 = 0 // - 10
7*a = -10 // : 7
a = -10/7
a = -10/7
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