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15=25-d
We move all terms to the left:
15-(25-d)=0
We add all the numbers together, and all the variables
-(-1d+25)+15=0
We get rid of parentheses
1d-25+15=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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