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D( a )
3*a+7 = 0
3*a+7 = 0
3*a+7 = 0
3*a+7 = 0 // - 7
3*a = -7 // : 3
a = -7/3
a in (-oo:-7/3) U (-7/3:+oo)
(2*a-5)/(3*a+7)-3 = 0
(2*a-5)/(3*a+7)+(-3*(3*a+7))/(3*a+7) = 0
2*a-3*(3*a+7)-5 = 0
-7*a-26 = 0
(-7*a-26)/(3*a+7) = 0
(-7*a-26)/(3*a+7) = 0 // * 3*a+7
-7*a-26 = 0
-7*a-26 = 0 // + 26
-7*a = 26 // : -7
a = 26/(-7)
a = -26/7
a = -26/7
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