d/4=-21 - solution

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Solution for d/4=-21 equation:

d in (-oo:+oo)

d/4 = -21 // + 21

d/4+21 = 0

1/4*d+21 = 0 // - 21

1/4*d = -21 // : 1/4

d = -21/1/4

d = -84

d = -84

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