Answer:
39
Explanation:
2d+33=6d+21
subtract 33 from both sides and simplify
2d=6d-12
subtract 6d from both sides and simplify
-4d=-12
simplify
d=3
Substitute 3 as d back into the equation for angle DGM
6(3)+21=39
DGM and YGR are vertical angles so set them equal to each other and once you have d, substitute it into DGM
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