d+9=2d+9

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


d in (-oo:+oo)

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

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

d-2*d-9+9 = 0

-1*d = 0 // : -1

d = 0

d = 0

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