Answer:
x=34
Explanation:
Alright.
x+12+100+x=180
2x+112=180
2x=68
x = 34
The 3 given angles form a straight angle and sum to 180°, hence
x + 12 + 100 + x = 180
2x + 112 = 180 ( subtract 112 from both sides )
2x = 68 ( divide both sides by 2 )
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