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igor_vitrenko [27]
3 years ago
7

S

Mathematics
1 answer:
lora16 [44]3 years ago
7 0

Answer:

  B.  9

Step-by-step explanation:

We assume that ...

  SU = ST +TU

  133 = (9x-5) +(5x+12)

  126 = 14x . . . . . subtract 7, collect terms

  9 = x . . . . . . . . . divide by 14

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