15/a=20/4

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Solution for 15/a=20/4 equation: 


D( a )

a = 0

a = 0

a = 0

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

15/a = 20/4 // - 20/4

15/a-(20/4) = 0

15/a-5 = 0

15*a^-1 = 5 // : 15

a^-1 = 1/3

-1 < 0

1/(a^1) = 1/3 // * a^1

1 = 1/3*a^1 // : 1/3

3 = a^1

a = 3

a = 3

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