-5/6+1/2d-5/7d=-31/21

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Solution for -5/6+1/2d-5/7d=-31/21 equation: 


d in (-oo:+oo)

(1/2)*d-((5/7)*d)-5/6 = -31/21 // + -31/21

(1/2)*d-((5/7)*d)-5/6-(-31/21) = 0

(1/2)*d+(-5/7)*d-5/6+31/21 = 0

9/14-3/14*d = 0 // - 9/14

-3/14*d = -9/14 // : -3/14

d = -9/14/(-3/14)

d = 3

d = 3

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