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