1/2d-9=4 - solution

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Solution for 1/2d-9=4 equation:

d in (-oo:+oo)

(1/2)*d-9 = 4 // - 4

(1/2)*d-9-4 = 0

1/2*d-13 = 0 // + 13

1/2*d = 13 // : 1/2

d = 13/1/2

d = 26

d = 26

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