I know what to do but I don't know what to do. does that make sense?

ANSWER
80 degrees
EXPLANATION
We have that TQ bisects line TQ divides
We are given that:
Since TQ bisects
=> 12x + 4 = 15x - 5
Collect like terms:
15x - 12x = 4 + 5
3x = 9
x = 3
To find find it, since:
So:
=>