12+d/6=-21 - solution

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Solution for 12+d/6=-21 equation:

d in (-oo:+oo)

d/6+12 = -21 // + 21

d/6+12+21 = 0

1/6*d+33 = 0 // - 33

1/6*d = -33 // : 1/6

d = -33/1/6

d = -198

d = -198

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