how would I solve for f(x)=g(x)? say we are given the equations f(x)= 3x-12 and g(x)=5x+20 what would I be solving? this is probably review from something I did years ago, but I cant remember​

Abilliard ball is struck by a cue. it travels 1 0 0 cm 100cm before ricocheting off a rail and traveling another 1 2 0 cm 120cm into a corner pocket. the angle between the path as the ball approaches the rail and the path after it strikes the rail is 4 5 ∘ 45 ∘ . how far is the corner pocket from where the cue initially struck the ball? do not round during your calculations. round your final answer to the nearest centimeter.