Which equation can be used to solve for x in the following diagram?

Answer:
Step-by-step explanation:
opposite angles = congruent
150 : 10x = 1 : 1
150 : 10x = 1
15x = 1
x = 15
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check
150 : 10 * 150 = 1 : 1
150 : 150 = 1 : 1
1 : 1 = 1 : 1
the answer is good