21/13=42/a

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Solution for 21/13=42/a equation: 


D( a )

a = 0

a = 0

a = 0

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

21/13 = 42/a // - 42/a

21/13-(42/a) = 0

21/13-42*a^-1 = 0

-42*a^-1 = -21/13 // : -42

a^-1 = 1/26

-1 < 0

1/(a^1) = 1/26 // * a^1

1 = 1/26*a^1 // : 1/26

26 = a^1

a = 26

a = 26

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