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49=16+3d
We move all terms to the left:
49-(16+3d)=0
We add all the numbers together, and all the variables
-(3d+16)+49=0
We get rid of parentheses
-3d-16+49=0
We add all the numbers together, and all the variables
-3d+33=0
We move all terms containing d to the left, all other terms to the right
-3d=-33
d=-33/-3
d=+11
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