1/2d-4=7

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Solution for 1/2d-4=7 equation: 


d in (-oo:+oo)

(1/2)*d-4 = 7 // - 7

(1/2)*d-7-4 = 0

1/2*d-11 = 0 // + 11

1/2*d = 11 // : 1/2

d = 11/1/2

d = 22

d = 22

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