5,7-10-1,81л=18+5,7-5,81л
-1,81л+5,81л=23,7-5,7+10
4л=28
л=28/4
л=7
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5,7-10-1,81л=18+5,7-5,81л
-1,81л+5,81л=23,7-5,7+10
4л=28
л=28/4
л=7