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17=21-4d
We move all terms to the left:
17-(21-4d)=0
We add all the numbers together, and all the variables
-(-4d+21)+17=0
We get rid of parentheses
4d-21+17=0
We add all the numbers together, and all the variables
4d-4=0
We move all terms containing d to the left, all other terms to the right
4d=4
d=4/4
d=1
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