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

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2
1
0
2:1=2; 2+5=7; 7-7=0
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flagSpain
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0%
0%
90%
10
flagPoland
4%
4%
6%
83%
3807
flagGermany
13%
6%
0%
80%
15
flagIndia
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4%
9%
76%
21
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11%
19%
65%
26
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21%
52%
19
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36%
54%
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11