They gave you (blue) find the measurement of (yellow) since (blue)+(yellow) make up a line they =180
105+(yellow)=180
-105 both sides
yellow= 75
1/2a - 1/2 = 1/2(a - 1)
You can factor out the 1/2.
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Answer:
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30/4 is also equal to 7 1/2.
30/4 = 7.5