12/21=4/q

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Solution for 12/21=4/q equation: 


D( q )

q = 0

q = 0

q = 0

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

12/21 = 4/q // - 4/q

12/21-(4/q) = 0

12/21-4*q^-1 = 0

-4*q^-1 = -4/7 // : -4

q^-1 = 1/7

-1 < 0

1/(q^1) = 1/7 // * q^1

1 = 1/7*q^1 // : 1/7

7 = q^1

q = 7

q = 7

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