c/2=-21 - solution

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Solution for c/2=-21 equation:

c in (-oo:+oo)

c/2 = -21 // + 21

c/2+21 = 0

1/2*c+21 = 0 // - 21

1/2*c = -21 // : 1/2

c = -21/1/2

c = -42

c = -42

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