Помогите!!!!!!!!!!!!!

Question

Помогите!!!!!!!!!!!!!

---

Answer 1

1) 2х = 7
    х= 7 : 2
    х = 3 1/2
-------------------
2) 120х = 80
     х = 80 : 120
     х = 8/12
     х = 2/3
---------------------
3) 75х = 15
    х = 15 : 75
    х = 15/75
    х = 1/5
---------------------
84х = 112
х = 112 : 84
х = 1 28/84
х = 1 1/3