2d+4+d=25

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Solution for 2d+4+d=25 equation: 


d in (-oo:+oo)

2*d+d+4 = 25 // - 25

2*d+d-25+4 = 0

3*d-21 = 0 // + 21

3*d = 21 // : 3

d = 21/3

d = 7

d = 7

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