C/9=21 - solution

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Solution for C/9=21 equation:

C in (-oo:+oo)

C/9 = 21 // - 21

C/9-21 = 0

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

1/9*C = 21 // : 1/9

C = 21/1/9

C = 189

C = 189

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