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-d-20d+3=-20d+17
We move all terms to the left:
-d-20d+3-(-20d+17)=0
We add all the numbers together, and all the variables
-21d-(-20d+17)+3=0
We get rid of parentheses
-21d+20d-17+3=0
We add all the numbers together, and all the variables
-1d-14=0
We move all terms containing d to the left, all other terms to the right
-d=14
d=14/-1
d=-14
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