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19=1+3d
We move all terms to the left:
19-(1+3d)=0
We add all the numbers together, and all the variables
-(3d+1)+19=0
We get rid of parentheses
-3d-1+19=0
We add all the numbers together, and all the variables
-3d+18=0
We move all terms containing d to the left, all other terms to the right
-3d=-18
d=-18/-3
d=+6
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