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-(12-7d)=-49
We move all terms to the left:
-(12-7d)-(-49)=0
We add all the numbers together, and all the variables
-(-7d+12)-(-49)=0
We add all the numbers together, and all the variables
-(-7d+12)+49=0
We get rid of parentheses
7d-12+49=0
We add all the numbers together, and all the variables
7d+37=0
We move all terms containing d to the left, all other terms to the right
7d=-37
d=-37/7
d=-5+2/7
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