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-19d-4=-7-20d-10
We move all terms to the left:
-19d-4-(-7-20d-10)=0
We add all the numbers together, and all the variables
-19d-(-20d-17)-4=0
We get rid of parentheses
-19d+20d+17-4=0
We add all the numbers together, and all the variables
d+13=0
We move all terms containing d to the left, all other terms to the right
d=-13
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