Answer:
75
Explanation:
2x-45+x=180
3x-45=180
3x=225
x=75
Adjacent angles add to 180
x + 2x-45 = 180
Combine like terms
3x - 45 = 180
Add 45 to each side
3x = 180+45
3x =225
Divide by 3
3x/3 = 225/3
x =75
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