9+2d=15

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Solution for 9+2d=15 equation: 


d in (-oo:+oo)

2*d+9 = 15 // - 15

2*d-15+9 = 0

2*d-6 = 0 // + 6

2*d = 6 // : 2

d = 6/2

d = 3

d = 3

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