Solve for D
D=23
Assign D
D≔23
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D=9-\left(-12\right)+\frac{4}{2}
Add 7 and 2 to get 9.
D=9+12+\frac{4}{2}
The opposite of -12 is 12.
D=21+\frac{4}{2}
Add 9 and 12 to get 21.
D=21+2
Divide 4 by 2 to get 2.
D=23
Add 21 and 2 to get 23.
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