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31(d-971)=589
We move all terms to the left:
31(d-971)-(589)=0
We multiply parentheses
31d-30101-589=0
We add all the numbers together, and all the variables
31d-30690=0
We move all terms containing d to the left, all other terms to the right
31d=30690
d=30690/31
d=990
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