Find the measures. With steps please.
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Answer:
sum of the given angles = 180°
12+5x+17x+4=180°
16+22x=180°
22x=164°
x=164°/22
x=7.45
substitute
to verify
12+5(7.45)+17(7.45)+4
12+37.25+126.65+4
16+163.9=179.9 ~ 180°
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