9=7+d/2

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Solution for 9=7+d/2 equation: 


d in (-oo:+oo)

9 = d/2+7 // - d/2+7

9-(d/2)-7 = 0

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

-1/2*d = -2 // : -1/2

d = -2/(-1/2)

d = 4

d = 4

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