3/9=X/21 - solution

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Solution for 3/9=X/21 equation:

X in (-oo:+oo)

3/9 = X/21 // - X/21

3/9-(X/21) = 0

1/3-1/21*X = 0 // - 1/3

-1/21*X = -1/3 // : -1/21

X = -1/3/(-1/21)

X = 7

X = 7

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