Where x is the length of the first piece

so the first piece is 3 inches, the second is 6 inches and the third is 19 inches
Because they’re both the opposites of eachothers quantities
According to a calculator, this is the answer: 0.1923076923. Hope this helped?
Answer:
x=12.
Step-by-step explanation:
Let's get this straight out of the way, the 3 angles of a triangle ALWAYS add up to 180. Now that that's said, lets begin. Since the opposing side of an angle is the same as the regular side, we simplify to get: 5x+120=180. 180-120=60. so 5x=60. 60/5=12. so x=12.