7-2d+4d=25

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Solution for 7-2d+4d=25 equation: 


d in (-oo:+oo)

4*d-(2*d)+7 = 25 // - 25

4*d-(2*d)-25+7 = 0

4*d-2*d-25+7 = 0

2*d-18 = 0 // + 18

2*d = 18 // : 2

d = 18/2

d = 9

d = 9

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