Find ST if S is between R and T, SR = 2x + 7, ST = x-6, and RT = 21.
SR = 2x + 7
ST = x - 6
RT = 21
SR + ST = RT
2x + 7 + x - 6 = 21
3x = 21 - 7 + 6
3x = 20
x = 20/3
ST = 20/3 - 6
ST = 20/3 - 18/3
ST = 2/3
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Verified answer
SR = 2x + 7
ST = x - 6
RT = 21
SR + ST = RT
2x + 7 + x - 6 = 21
3x = 21 - 7 + 6
3x = 20
x = 20/3
ST = x - 6
ST = 20/3 - 6
ST = 20/3 - 18/3
ST = 2/3
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