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7-10d=7+9d
We move all terms to the left:
7-10d-(7+9d)=0
We add all the numbers together, and all the variables
-10d-(9d+7)+7=0
We get rid of parentheses
-10d-9d-7+7=0
We add all the numbers together, and all the variables
-19d=0
d=0/-19
d=0
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