решить!1300-(d-678)=400
1300-(d-678)=400
d-678=1300-400
d-678=900
d=900+678
d=1578
1300-(1578-678)=400
1300-900=400
400=400
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Verified answer
1300-(d-678)=400
d-678=1300-400
d-678=900
d=900+678
d=1578
1300-(1578-678)=400
1300-900=400
400=400