1 a+b
2 s-r
3 4m+7n-3mn -6
4 2a+3b+4c+ 2c
5 123abc
I don't understand
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Answers & Comments
1 a+b
2 s-r
3 4m+7n-3mn -6
4 2a+3b+4c+ 2c
5 123abc
I don't understand