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-13=5+d
We move all terms to the left:
-13-(5+d)=0
We add all the numbers together, and all the variables
-(d+5)-13=0
We get rid of parentheses
-d-5-13=0
We add all the numbers together, and all the variables
-1d-18=0
We move all terms containing d to the left, all other terms to the right
-d=18
d=18/-1
d=-18
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