2d+9+2d=1 - solution

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Solution for 2d+9+2d=1 equation:

d in (-oo:+oo)

2*d+2*d+9 = 1 // - 1

2*d+2*d-1+9 = 0

4*d+8 = 0 // - 8

4*d = -8 // : 4

d = -8/4

d = -2

d = -2

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