(8,3-k)*4,7=5,64
8,3-k=5,64:4,7
8,3-k=1,2
k=8,3-1,2
k=7,1
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Verified answer
(8,3-k)*4,7=5,64
8,3-k=5,64:4,7
8,3-k=1,2
k=8,3-1,2
k=7,1
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