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d= 45cm
fob=?
fok=?
d=fob+fok
45=fob+fok
fob=45- fok
M=fob/fok
8= (45-fok)/fok
8fok = 45-fok
9fok=45
fok = 5cm
d=fob+fok
45=fob + 5
fob=40 cm