c/4+12=21 - solution

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Solution for c/4+12=21 equation:

c in (-oo:+oo)

c/4+12 = 21 // - 21

c/4-21+12 = 0

1/4*c-9 = 0 // + 9

1/4*c = 9 // : 1/4

c = 9/1/4

c = 36

c = 36

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