9+2d+4d=57

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Solution for 9+2d+4d=57 equation: 


d in (-oo:+oo)

2*d+4*d+9 = 57 // - 57

2*d+4*d-57+9 = 0

6*d-48 = 0 // + 48

6*d = 48 // : 6

d = 48/6

d = 8

d = 8

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