d/3-9=-2 - solution

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Solution for d/3-9=-2 equation:

d in (-oo:+oo)

d/3-9 = -2 // + 2

d/3-9+2 = 0

1/3*d-7 = 0 // + 7

1/3*d = 7 // : 1/3

d = 7/1/3

d = 21

d = 21

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