9=21-x/9 - solution

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Solution for 9=21-x/9 equation:

x in (-oo:+oo)

9 = 21-(x/9) // - 21-(x/9)

x/9-21+9 = 0

1/9*x-12 = 0 // + 12

1/9*x = 12 // : 1/9

x = 12/1/9

x = 108

x = 108

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