Angles on a straight line add up to 180 degrees so
45 + 3x = 180
Subtract 45 from both sides to remove the 45 on the left
3x = 135
Then divide both sides by 3
x = 45
Answer is X = 45
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Step one
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Did not add to both sides
Acute angles because they are less then 90 degrees which is a right angle.
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the answer is
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