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steposvetlana [31]
3 years ago
10

Someone help and solve for X

Mathematics
1 answer:
IgorC [24]3 years ago
7 0

Step-by-step explanation:

since all angles add up to 180:

(8x-1)+(3x+4)+(3x+9)=180

add like terms:

14x+12=180

x=12

Hope that helps :)

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