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-19d-13=10-20d-9
We move all terms to the left:
-19d-13-(10-20d-9)=0
We add all the numbers together, and all the variables
-19d-(-20d+1)-13=0
We get rid of parentheses
-19d+20d-1-13=0
We add all the numbers together, and all the variables
d-14=0
We move all terms containing d to the left, all other terms to the right
d=14
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