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What is the value of x when x + 7 = 21?

The first side of a triangle measures 5 in less than the second side, the third side is 3 in more than the first side, and the perimeter is 17 in. how long is the third side? if s represents the length of the second side, which of the following represents the length of the third side? s-5 ws-2 s+ 3 next question ask for turn it in

Look at triangle wxy what is the length (in centimeters) of the side wy of the triangle?