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Sagot :
Answer:
[tex]total \: angleof \: a \: triangle = 180 \\ then \\ x + 3x - 1 + x - 19 = 180 \\ 5x - 20 = 180 \\ 5x = 180 + 20 \\ 5x = 200 \\ x = \frac{200}{5} \\ x = 40 \\ thank \: you[/tex]
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