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Verified answer
W=300 Js=200 cm=0,2 m
F2=120 N
F3=100 N
F1?
W=(F1-F2+F3).s
300=(F-120+100).0,2
300=(F-20).0,2
300=0,2F-4
300+4=0,2F
F=304/0,2
F=1520 Newton