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4d+9d-(7-6d)=4d+9d-7-6d
We move all terms to the left:
4d+9d-(7-6d)-(4d+9d-7-6d)=0
We add all the numbers together, and all the variables
4d+9d-(-6d+7)-(7d-7)=0
We add all the numbers together, and all the variables
13d-(-6d+7)-(7d-7)=0
We get rid of parentheses
13d+6d-7d-7+7=0
We add all the numbers together, and all the variables
12d=0
d=0/12
d=0
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