The question number is 6
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by the property of remote interior angle theorem,
BCD=BAC+ABC
5X-60=15+(2X+3)
5X-60=15+2X+3
5X-60=18+2X
5X-2X=18+60
3X=78
X=78/3
X=26
ABC=2X+3
ABC=2(26)+3
ABC=52+3
ABC=55
Hope this answer helps u
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