There are 60 bird in the trees,After a while,4 birds fly to
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There are 60 bird in the trees,After a while,4 birds fly to the second tree from the first tree and 7 birds fly to third tree tree from the second tree.Then there are 20bieds in every tree.DO you know how many bieds are in every tree at first?
x+y+z=60
x-4=20
y+4-7=20
z+7=20
x 24
y 23
z 13
x-4=20
y+4-7=20
z+7=20
x 24
y 23
z 13
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