17x-3=15x+5 because angle 3 and 7 are congruent. Then we find that x=4. Then you plug in 4 for x so 15(4)+5=65 so 65 is your answer. To check make sure 4=x makes sense for the other equation 17(4)-3=65 and 65=65 so you know you’re right. Answer is 65
