6/12=X/21 - solution

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Solution for 6/12=X/21 equation:

X in (-oo:+oo)

6/12 = X/21 // - X/21

6/12-(X/21) = 0

1/2-1/21*X = 0 // - 1/2

-1/21*X = -1/2 // : -1/21

X = -1/2/(-1/21)

X = 21/2

X = 21/2

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