8/28=12/a

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Solution for 8/28=12/a equation: 


D( a )

a = 0

a = 0

a = 0

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

8/28 = 12/a // - 12/a

8/28-(12/a) = 0

8/28-12*a^-1 = 0

-12*a^-1 = -2/7 // : -12

a^-1 = 1/42

-1 < 0

1/(a^1) = 1/42 // * a^1

1 = 1/42*a^1 // : 1/42

42 = a^1

a = 42

a = 42

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