You can put this solution on YOUR website! Thanks for the additional information. Here is how to solve for d:
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Subtract 2c from both sides.
Multiply both sides by 3.
We can reverse the order of the equation since both sides are equivalent to each other.
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I noticed that other students posted a similar problem. I wonder if you meant to use parentheses when you posted your question. Here's a solution to the other problem:
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Multiply both sides by 3.
Subtract 2c from both sides.
Rewrite with d on the left side.
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Good luck with you math!