R3,R5=2000
(R3+R4)*R4=V/0.4=12.5
(2000+R4)*R4=12.5
R4^2+2000R4-12.5=0
R4=0.006249980465
(R5+R7)*R7=V/0.775=6.452
R7^2+2000R7-6.452=0
R7=0.003225994795
R3,R5=2000
(R3+R4)*R4=V/0.4=12.5
(2000+R4)*R4=12.5
R4^2+2000R4-12.5=0
R4=0.006249980465
(R5+R7)*R7=V/0.775=6.452
R7^2+2000R7-6.452=0
R7=0.003225994795