1) =2а
2) =5b+4
3) =4
4) = -20n+5m
6а-5а+8а-7а=2а
9в+12-8-4в=5в+4
5с+4-2с-3с=4
-7n+8m-13n-3m=-20n+5n
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Verified answer
1) =2а
2) =5b+4
3) =4
4) = -20n+5m
6а-5а+8а-7а=2а
9в+12-8-4в=5в+4
5с+4-2с-3с=4
-7n+8m-13n-3m=-20n+5n