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29-d/21=20
We move all terms to the left:
29-d/21-(20)=0
We add all the numbers together, and all the variables
-d/21+9=0
We multiply all the terms by the denominator
-d+9*21=0
We add all the numbers together, and all the variables
-1d+189=0
We move all terms containing d to the left, all other terms to the right
-d=-189
d=-189/-1
d=+189
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