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13=10+d/2
We move all terms to the left:
13-(10+d/2)=0
We add all the numbers together, and all the variables
-(d/2+10)+13=0
We get rid of parentheses
-d/2-10+13=0
We multiply all the terms by the denominator
-d-10*2+13*2=0
We add all the numbers together, and all the variables
-1d+6=0
We move all terms containing d to the left, all other terms to the right
-d=-6
d=-6/-1
d=+6
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