D/2-1=9 - solution

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Solution for D/2-1=9 equation:

D in (-oo:+oo)

D/2-1 = 9 // - 9

D/2-9-1 = 0

1/2*D-10 = 0 // + 10

1/2*D = 10 // : 1/2

D = 10/1/2

D = 20

D = 20

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