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In an equilateral triangle, all 3 sides are the same length, so your equation would look something like this:

P=the perimeter of the triangle

(x+3)=length of each side

P=3(x+3)

If you wanted to simplify further, you would distribute the 3 to both the x and the 3 inside of the parentheses, giving you P=3x+9.

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Q: The side length of an equilateral triangle is x plus 3 write an expression for the perimeter of a triangle?
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