1/2d-4=21

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Solution for 1/2d-4=21 equation: 


d in (-oo:+oo)

(1/2)*d-4 = 21 // - 21

(1/2)*d-21-4 = 0

1/2*d-25 = 0 // + 25

1/2*d = 25 // : 1/2

d = 25/1/2

d = 50

d = 50

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