D/3-9=12 - solution

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Solution for D/3-9=12 equation:

D in (-oo:+oo)

D/3-9 = 12 // - 12

D/3-12-9 = 0

1/3*D-21 = 0 // + 21

1/3*D = 21 // : 1/3

D = 21/1/3

D = 63

D = 63

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