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9-19d=-7-20d
We move all terms to the left:
9-19d-(-7-20d)=0
We add all the numbers together, and all the variables
-19d-(-20d-7)+9=0
We get rid of parentheses
-19d+20d+7+9=0
We add all the numbers together, and all the variables
d+16=0
We move all terms containing d to the left, all other terms to the right
d=-16
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