28/a=4+16

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Solution for 28/a=4+16 equation: 


D( a )

a = 0

a = 0

a = 0

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

28/a = 4+16 // - 4+16

28/a-16-4 = 0

28*a^-1 = 20 // : 28

a^-1 = 5/7

-1 < 0

1/(a^1) = 5/7 // * a^1

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

7/5 = a^1

a = 7/5

a = 7/5

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