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10-(-d)=-3
We move all terms to the left:
10-(-d)-(-3)=0
We add all the numbers together, and all the variables
-(-1d)+10-(-3)=0
We add all the numbers together, and all the variables
-(-1d)+13=0
We get rid of parentheses
1d+13=0
We add all the numbers together, and all the variables
d+13=0
We move all terms containing d to the left, all other terms to the right
d=-13
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