j23418 j23418
  • 22-02-2021
  • Mathematics
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I need help please❤️❤️❤️❤️

I need help please class=

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thebecks
thebecks thebecks
  • 22-02-2021

Answer:

x = 5

Step-by-step explanation:

the supplementary angle of (19x-18) = 180 - (19x-18) = 198-19x

all interior angles of a triangle = 180 degrees

180 = (7x+1) + (10x-9) + (198-19x)

180 = 7x+10X-19x+1-9+198

180 = -2x+190

-2x = -10

x = 5

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