My teacher laid out the problem please help me fill in the gaps

Problem (4) Is a HMK and in class problem: Using Kirchhoff's rules, (a) find the current in each resistor shown and (b) find the potential difference between points c and f. R3 = 4.00 kn 61 = 70.0 V E2 = 60.0 V 63 = 80.0 V R2 = 3.00 kn R1 = 2.00 kn (a) E := 70.0 .V E2:= 60.0 . V E3:=80.0 .V R, := 2.00 kn R2:= 3.00 . kS R3 := 4.00 . kn I1= 1.00 . A 12:= 1.00 . A 13:=1.00 . A Guess Values I= 12+13 KCL at C Constraints E1-E2-13. R2- I1 . R, =0 KVL at C CW L1 E2-E3 + 13 . R2-R3 . 12=0 KVL at C CW L2 3.85 - 10 4 Solver Find (1 1 , I2, 13) = -2.69 -10 3 A 3.08 - 10-3 (b) I3:=3.08 - 10 3 A AV :=-82-13. R2=-69.2 V