solve 5d-8=3+7d for d

or any question with an uknown  number on both sides.
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1 Answer

5d - 8 = 3 + 7d

5d - 8 - 5d = 3 + 7d - 5d

-8 = 3 + 2d

-8 - 3 = 3 + 2d - 3

-11 = 2d

-11/2 = 2d/2

-5.5 = d
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