d-3=-1/2d+21/2

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Solution for d-3=-1/2d+21/2 equation: 


d in (-oo:+oo)

d-3 = (-1/2)*d+21/2 // - (-1/2)*d+21/2

d-((-1/2)*d)-(21/2)-3 = 0

d+(1/2)*d-21/2-3 = 0

3/2*d-27/2 = 0 // + 27/2

3/2*d = 27/2 // : 3/2

d = 27/2/3/2

d = 9

d = 9

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