6+c/9=-21 - solution

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Solution for 6+c/9=-21 equation:

c in (-oo:+oo)

c/9+6 = -21 // + 21

c/9+6+21 = 0

1/9*c+27 = 0 // - 27

1/9*c = -27 // : 1/9

c = -27/1/9

c = -243

c = -243

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