D/2+7=9

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Solution for D/2+7=9 equation: 


D in (-oo:+oo)

D/2+7 = 9 // - 9

D/2-9+7 = 0

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

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

D = 2/1/2

D = 4

D = 4

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