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19=16+d
We move all terms to the left:
19-(16+d)=0
We add all the numbers together, and all the variables
-(d+16)+19=0
We get rid of parentheses
-d-16+19=0
We add all the numbers together, and all the variables
-1d+3=0
We move all terms containing d to the left, all other terms to the right
-d=-3
d=-3/-1
d=+3
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