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d=-13+2d
We move all terms to the left:
d-(-13+2d)=0
We add all the numbers together, and all the variables
d-(2d-13)=0
We get rid of parentheses
d-2d+13=0
We add all the numbers together, and all the variables
-1d+13=0
We move all terms containing d to the left, all other terms to the right
-d=-13
d=-13/-1
d=+13
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