8,19+а-5,8-3,19+5,8= а+13,99-8,99= а+5
Если а= -2,3/7: -2,3/7 +5= 3, 3/7
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8,19+а-5,8-3,19+5,8= а+13,99-8,99= а+5
Если а= -2,3/7: -2,3/7 +5= 3, 3/7