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The perimeter of triangle ABC is 4x+1,if 2 sides are x+2 and x-1,find the 3rd side

  • algebra -

    what's the problem?
    perimeter is the sum of the sides.
    Let z be the third side.

    x+2 + x-1 + z = 4x+1
    z = 4x+1 - (x+2) - (x-1)
    z = 4x+1-x-2-x+1
    z = 2x

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