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