Solve for d
d=-4
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3-\left(-1\right)=8+d
The opposite of -3 is 3.
3+1=8+d
The opposite of -1 is 1.
4=8+d
Add 3 and 1 to get 4.
8+d=4
Swap sides so that all variable terms are on the left hand side.
d=4-8
Subtract 8 from both sides.
d=-4
Subtract 8 from 4 to get -4.
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