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The length of the rectangle is 8, smaller than three times the width. If we increase the width by 5% of the length and the length is reduced by 14% of the width, the circumference of the rectangle will be increased by 30 m. What are the dimensions of the rectangle?

### Correct answer:

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#### You need to know the following knowledge to solve this word math problem:

**algebra**- system of equations
- expression of a variable from the formula
**planimetrics**- perimeter
- rectangle
**basic functions**- percentages

#### Units of physical quantities:

#### Grade of the word problem:

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