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-8-19d=-13-10d-13
We move all terms to the left:
-8-19d-(-13-10d-13)=0
We add all the numbers together, and all the variables
-19d-(-10d-26)-8=0
We get rid of parentheses
-19d+10d+26-8=0
We add all the numbers together, and all the variables
-9d+18=0
We move all terms containing d to the left, all other terms to the right
-9d=-18
d=-18/-9
d=+2
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