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