(28a+4)/((7a+1)*(7a-1))

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Solution for (28a+4)/((7a+1)*(7a-1)) equation: 


D( a )

(7*a+1)*(7*a-1) = 0

(7*a+1)*(7*a-1) = 0

(7*a+1)*(7*a-1) = 0

( 7*a+1 )

7*a+1 = 0 // - 1

7*a = -1 // : 7

a = -1/7

( 7*a-1 )

7*a-1 = 0 // + 1

7*a = 1 // : 7

a = 1/7

a in (-oo:-1/7) U (-1/7:1/7) U (1/7:+oo)

(28*a+4)/((7*a+1)*(7*a-1)) = 0

28*a+4 = 0 // - 4

28*a = -4 // : 28

a = -4/28

a = -1/7

a in { -1/7} 

a belongs to the empty set

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