NEED HELP WITH A PROBLEM!

tampham

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My friends and I are arguing over the correct answer, we're trying to find the measure of angle DBC, if anyone can offer their insight then that'd be appreciated!
 

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My friends and I are arguing over the correct answer, we're trying to find the measure of angle DBC, if anyone can offer their insight then that'd be appreciated!
We'll be happy to review your and your friends' solutions. Please post them.
 

My friends and I are arguing over the correct answer, we're trying to find the measure of angle DBC, if anyone can offer their insight then that'd be appreciated!
DBA and DBC are supplementary angles. Then:

mDBA + mDBC = ?

Then consider sum of all the interior angles of a triangle.
 
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