21/a=7/5

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Solution for 21/a=7/5 equation: 


D( a )

a = 0

a = 0

a = 0

a in (-oo:0) U (0:+oo)

21/a = 7/5 // - 7/5

21/a-(7/5) = 0

21/a-7/5 = 0

21*a^-1 = 7/5 // : 21

a^-1 = 1/15

-1 < 0

1/(a^1) = 1/15 // * a^1

1 = 1/15*a^1 // : 1/15

15 = a^1

a = 15

a = 15

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