45=d+2d+9

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Solution for 45=d+2d+9 equation: 


d in (-oo:+oo)

45 = d+2*d+9 // - d+2*d+9

45-d-(2*d)-9 = 0

45-d-2*d-9 = 0

36-3*d = 0 // - 36

-3*d = -36 // : -3

d = -36/(-3)

d = 12

d = 12

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