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The sum of the measures of two adjacent angles that form a right angle is 90°.
Therefore, we have the equation x + (x + 30) = 90.
Simplifying the equation, we get:
2x + 30 = 90
Subtracting 30 from both sides:
2x = 60
Dividing both sides by 2:
x = 30
Therefore, x is 30.