2d+9+4d=51

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Solution for 2d+9+4d=51 equation: 


d in (-oo:+oo)

2*d+4*d+9 = 51 // - 51

2*d+4*d-51+9 = 0

6*d-42 = 0 // + 42

6*d = 42 // : 6

d = 42/6

d = 7

d = 7

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