2000:f-670=1330
2000:f=670+1330
2000:f=2000
f=2000:2000
f=1
1300-(d-678)=400
1300-d+678=400
1300+678-400=d
d=1578
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Verified answer
2000:f-670=1330
2000:f=670+1330
2000:f=2000
f=2000:2000
f=1
1300-(d-678)=400
1300-d+678=400
1300+678-400=d
d=1578