3d+10=31 - solution

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Solution for 3d+10=31 equation:

d in (-oo:+oo)

3*d+10 = 31 // - 31

3*d-31+10 = 0

3*d-21 = 0 // + 21

3*d = 21 // : 3

d = 21/3

d = 7

d = 7

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