c/2+8=21 - solution

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Solution for c/2+8=21 equation:

c in (-oo:+oo)

c/2+8 = 21 // - 21

c/2-21+8 = 0

1/2*c-13 = 0 // + 13

1/2*c = 13 // : 1/2

c = 13/1/2

c = 26

c = 26

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