I believe the answer is A.
Answer:
Step-by-step explanation:
1/2x - 2/3 × 15 = 30
1/2x - 10 = 30
1/2x = 30 + 10
1/2x = 40
x = 40 × 2
x = 80
hope this helps
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128 degrees.
An angle's supplement, when added to the original angle, will form a straight (180 degree) angle.
