Question

Is 4d + (15 + 3d) equivalent to (4d + 15) + 3d ?

Answer 1

`\boxed{\boxed{\sf{Yes,~7d+15=7d+15}}}`

Solution Steps:

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1.) Solve
`\bold{4d+(15+3d)}`:

• Combine 4d and 3d:
  `=7d+15`

2.) Solve
`\bold{(4d+15)+3d}`:

• Combine 4d and 3d:
  `=7d+15`

3.) Compare:

• 
  `7d+15=7d+15`

So your answer
`\bold{7d+15=7d+15}`.

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Answer 2

Yes it is

Explanation:

4d + 3d = 7d so 7d + 15 would be the expression for both except it would only be 3d + 4d = 7d and 7d + 15 is the same as the first expression that I got from evaluating 4d + (15 + 3d).