Question

A=5x+20

∘
start color #11accd, angle, A, end color #11accd, equals, start color #11accd, 5, x, plus, 20, degrees, end color #11accd \qquad \green{\angle B} = \green{9x -92^\circ}∠B=9x−92

Answer 1

not sure what you’re asking ? but

move the terms
-5x+20-a

divide both sides
x=-4+1/5a

solution:
x=-4+1/5a