Answer:
The first is a because there is no “T”
The second isnt My specialty so sorry!
3x + 4 = PQ
So they share the same angle.
If I’m correct, isolate “x”
3x + 4 + R = 57
Subtract 4
Then you subtract 4 form 57 since the equation must be balanced.
3x + R = 53
Subtract R form both sides
3x = 57-R
Divide 3 form 3x and 57-R
The 3 cancels out and c is alone.
x = 19 - R
If I’m correct