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irina1246 [14]
3 years ago
8

I don't know how to start this problem, but I've done it in the past.

Mathematics
1 answer:
Agata [3.3K]3 years ago
7 0
You want to add the two expressions together and then set it equal to 180º.
9x+28 + 47-2x = 180º.
7x + 75=180º

Simplify from here :)
Let me know if you have more questions! Good luck!
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