21/q=7/9

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Solution for 21/q=7/9 equation: 


D( q )

q = 0

q = 0

q = 0

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

21/q = 7/9 // - 7/9

21/q-(7/9) = 0

21/q-7/9 = 0

21*q^-1 = 7/9 // : 21

q^-1 = 1/27

-1 < 0

1/(q^1) = 1/27 // * q^1

1 = 1/27*q^1 // : 1/27

27 = q^1

q = 27

q = 27

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