2.8:4/5=0.7:x

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2.8:4/5=0.7:x2.8:4/5=0.7:x2.8:4/5=0.7:x2.8:0.8=0.7:x

2.8:4/5=0.7:x
2.8:4/5=0.7:x

2.8:4/5=0.7:x
2.8:0.8=0.7:x