18=15-7/a

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Solution for 18=15-7/a equation: 


D( a )

a = 0

a = 0

a = 0

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

18 = 15-(7/a) // - 15-(7/a)

7/a-15+18 = 0

7*a^-1 = -3 // : 7

a^-1 = -3/7

-1 < 0

1/(a^1) = -3/7 // * a^1

1 = -3/7*a^1 // : -3/7

-7/3 = a^1

a = -7/3

a = -7/3

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