Solve for d
d=-18
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2d-6=-42
Swap sides so that all variable terms are on the left hand side.
2d=-42+6
Add 6 to both sides.
2d=-36
Add -42 and 6 to get -36.
d=\frac{-36}{2}
Divide both sides by 2.
d=-18
Divide -36 by 2 to get -18.
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