D/2-1=3 - solution

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Solution for D/2-1=3 equation:

D in (-oo:+oo)

D/2-1 = 3 // - 3

D/2-3-1 = 0

1/2*D-4 = 0 // + 4

1/2*D = 4 // : 1/2

D = 4/1/2

D = 8

D = 8

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