How much is it? 2:1 + 5-7?

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2
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0
2:1=2; 2+5=7; 7-7=0
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flagSpain
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0%
0%
90%
10
flagPoland
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4%
6%
83%
3809
flagIndia
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4%
9%
76%
21
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75%
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11%
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26
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52%
19
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11