They are vertical angles so you need to make the following equal 
7y=5y+36 and 3x-21=2x+4
Solve for y and then x 
7y=5y+36 
Subtract 5y on both sides to get 
2y=36 
Then divide by 2 on both sides to Get y=18
For 3x-21=2x+4, 
Subtract 2x on both sides to obtain 
x-21=4
Then add 21 to both sides to get 
x=25 
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