2d+6+d=15 - solution

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Solution for 2d+6+d=15 equation:

d in (-oo:+oo)

2*d+d+6 = 15 // - 15

2*d+d-15+6 = 0

3*d-9 = 0 // + 9

3*d = 9 // : 3

d = 9/3

d = 3

d = 3

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