Will mark brainliest if right

Answer:
It doesn't specify so . . .
If its the bottom right it's 90°
If it's the bottom left it's 48°
Step-by-step explanation:
Ok so first, the triangle is a right triangle
meaning there's a 90° angle
Great, We now know two angles
90° and 42°
All angles of a triangle add up to 180
so we make it into an equation
and solve it.
42 + 90 + 6x = 180
132 + 6x = 180
-132 -132
6x = 48
Divide by 6 to leave x by itself.
x = 8
Now we can see what 6x actually is
6 ( 8 ) = 48
Note: This is for the bottom left angle. 6x