In a particular triangle, the second side measures 5 less than twice the first side. The third side measures 3 more than the second side. In terms of x, what is the perimeter?

5x-7

If the first side is just x, then the second side must be 2x-5, or 5 less than twice the first. If this is the second side, then the third must be 2x-2, because the third side "measures 3 more than the second side."

The perimeter is 5x-7 = (x) + (2x-5) + (2x-2).