You didnt give the problem or explain anything all you said is what he has to pay i think you forgot to add something BUDDY careful next time =)
Answer: -2/5
Step-by-step explanation: It's -4/5 multiplied by 1/2 because you you have to find the reciprocal, so you flip 2, so it would become 1/2, then you multiply -4/5 and 1/2, which would get you -4/10, which can be reduced to -2/5. Hope this helps!
X = 180 - (37 + 53) is the correct answer