5d+6-2d=21

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Solution for 5d+6-2d=21 equation: 


d in (-oo:+oo)

5*d-(2*d)+6 = 21 // - 21

5*d-(2*d)-21+6 = 0

5*d-2*d-21+6 = 0

3*d-15 = 0 // + 15

3*d = 15 // : 3

d = 15/3

d = 5

d = 5

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