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30=-10-d
We move all terms to the left:
30-(-10-d)=0
We add all the numbers together, and all the variables
-(-1d-10)+30=0
We get rid of parentheses
1d+10+30=0
We add all the numbers together, and all the variables
d+40=0
We move all terms containing d to the left, all other terms to the right
d=-40
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