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1 | x + 28 = 53 = 53 - 28 =25 | . , . |
2 | - 34 = 26 = 34 + 26 =60 | . , . |
3 | 35 - z =19 z = 35 - 19 z = 16 | . , . |
4 | 7 = 56 = 56: 7 = 8 | . , . |
5 | b: 23 = 4 b = 23 4 b = 92 | . , . |
6 | 90: = 5 = 90: 5 = 18 | . , . |
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