SOLUTION:
The diagonally opposite angles in a parallelogram are equivalent to each other.
( 10y - 29 ) and ( 7y + 19 ) are diagonally opposite to each other.
Therefore:
10y - 29 = 7y + 19
10y - 7y = 10 + 29
3y = 39
y = 39 / 3
y = 13
FINAL ANSWER:
Therefore, the answer is:
y = 13
Hope this helps! :)
Have a lovely day! <3