2/7=4/a

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Solution for 2/7=4/a equation: 


D( a )

a = 0

a = 0

a = 0

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

2/7 = 4/a // - 4/a

2/7-(4/a) = 0

2/7-4*a^-1 = 0

-4*a^-1 = -2/7 // : -4

a^-1 = 1/14

-1 < 0

1/(a^1) = 1/14 // * a^1

1 = 1/14*a^1 // : 1/14

14 = a^1

a = 14

a = 14

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