Solve for d
d=4
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-6d-7-2d=-39
Subtract 2d from both sides.
-8d-7=-39
Combine -6d and -2d to get -8d.
-8d=-39+7
Add 7 to both sides.
-8d=-32
Add -39 and 7 to get -32.
d=\frac{-32}{-8}
Divide both sides by -8.
d=4
Divide -32 by -8 to get 4.
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