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4,2 + (-2,8 ) = 4,2 - 2,8 = 1,4
- 4,2 * ( - 5/6 ) = -4 1/5 - 5/6 = -4 6/30 - 25/30 = -4 31/30 = -5 1/30
14: 0,7 = 20