Solve for D
D=-3
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-10D-7=23
Swap sides so that all variable terms are on the left hand side.
-10D=23+7
Add 7 to both sides.
-10D=30
Add 23 and 7 to get 30.
D=\frac{30}{-10}
Divide both sides by -10.
D=-3
Divide 30 by -10 to get -3.
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