(x-2.8)÷7=2.8
解:(x-2.8)÷7*7=2.8*7
x-2.8=19.6
x-2.8+2.8=19.6+2.8
x=22.4
(x-2.8)÷7=2.8
x=19.6+2.8=22.4
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