1+7d+2d=19

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Solution for 1+7d+2d=19 equation: 


d in (-oo:+oo)

7*d+2*d+1 = 19 // - 19

7*d+2*d-19+1 = 0

9*d-18 = 0 // + 18

9*d = 18 // : 9

d = 18/9

d = 2

d = 2

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