90 degrees + 5x + x needs to equal 180 degrees cant figure out the variables though

Pls i’m too dumb to know what i’m doing right now

For the equations below which statement is true ? -2x=14 6x=-42

1) in triangle the, what is the measure of angle t (in degrees)? 2) in triangle bat, the measure of angle b is 66∘, and the measure of angle t is 77∘.what is the measure of the exterior angle at a (in degrees)?