7/5=21/a

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Solution for 7/5=21/a equation: 


D( a )

a = 0

a = 0

a = 0

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

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

7/5-(21/a) = 0

7/5-21*a^-1 = 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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