4/7=9/a-7

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Solution for 4/7=9/a-7 equation: 


D( a )

a = 0

a = 0

a = 0

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

4/7 = 9/a-7 // - 9/a-7

4/7-(9/a)+7 = 0

4/7-9*a^-1+7 = 0

-9*a^-1 = -53/7 // : -9

a^-1 = 53/63

-1 < 0

1/(a^1) = 53/63 // * a^1

1 = 53/63*a^1 // : 53/63

63/53 = a^1

a = 63/53

a = 63/53

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