X/9=21 - solution

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Solution for X/9=21 equation:

X in (-oo:+oo)

X/9 = 21 // - 21

X/9-21 = 0

1/9*X-21 = 0 // + 21

1/9*X = 21 // : 1/9

X = 21/1/9

X = 189

X = 189

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