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6d+10d-19=20+13d
We move all terms to the left:
6d+10d-19-(20+13d)=0
We add all the numbers together, and all the variables
6d+10d-(13d+20)-19=0
We add all the numbers together, and all the variables
16d-(13d+20)-19=0
We get rid of parentheses
16d-13d-20-19=0
We add all the numbers together, and all the variables
3d-39=0
We move all terms containing d to the left, all other terms to the right
3d=39
d=39/3
d=13
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