Answer:
x = 90
Step-by-step explanation:
2(45° ) + x = 180°
Distribute
90 +x = 180
Subtract 90 from each side
90+x-90 =180-90
Multiply 45 by 2:
2(45) + x = 180
90 + x = 180
Subtract 90 from both sides:
-90 - 90
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