2/3-5/7d+1/3d=86/21

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Solution for 2/3-5/7d+1/3d=86/21 equation: 


d in (-oo:+oo)

(1/3)*d-((5/7)*d)+2/3 = 86/21 // - 86/21

(1/3)*d-((5/7)*d)+2/3-(86/21) = 0

(-5/7)*d+(1/3)*d+2/3-86/21 = 0

-8/21*d-24/7 = 0 // + 24/7

-8/21*d = 24/7 // : -8/21

d = 24/7/(-8/21)

d = -9

d = -9

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