2/1=4/a

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Solution for 2/1=4/a equation: 


D( a )

a = 0

a = 0

a = 0

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

2/1 = 4/a // - 4/a

2/1-(4/a) = 0

2-4*a^-1 = 0

-4*a^-1 = -2 // : -4

a^-1 = 1/2

-1 < 0

1/(a^1) = 1/2 // * a^1

1 = 1/2*a^1 // : 1/2

2 = a^1

a = 2

a = 2

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