-2/7d-1/2-2/7d=-31/14

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Solution for -2/7d-1/2-2/7d=-31/14 equation: 


d in (-oo:+oo)

(-2/7)*d-((2/7)*d)-(1/2) = -31/14 // + -31/14

(-2/7)*d-((2/7)*d)-(1/2)-(-31/14) = 0

(-2/7)*d+(-2/7)*d-1/2+31/14 = 0

12/7-4/7*d = 0 // - 12/7

-4/7*d = -12/7 // : -4/7

d = -12/7/(-4/7)

d = 3

d = 3

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