21/(15a-21)

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Solution for 21/(15a-21) equation: 


D( a )

15*a-21 = 0

15*a-21 = 0

15*a-21 = 0

15*a-21 = 0 // + 21

15*a = 21 // : 15

a = 21/15

a = 7/5

a in (-oo:7/5) U (7/5:+oo)

21/(15*a-21) = 0

a belongs to the empty set

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