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Answer:
X = 11
Step-by-step explanation:
since the angles are supplementary that means their sum is 180
[tex]5x + 15 + 10x = 180 \\ 15x + 15 = 180 \\ 15x = 180 - 15 \\ 15x = 165 \\ x = 165 \div 15 \\ x = 11[/tex]