2.33.
1)3a-7+2a=5a-7;
2)5b²-9-4b²-b+5=b²-b-4;
3)4x+2-x+1=3x+3;
4)3m²+m-1-m+3m²=6m²-1;
5)2a-3b-(-b)-a=2a-3b+b-a=a-2b;
6)a²+a+1-a²-a+1=2.
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2.33.
1)3a-7+2a=5a-7;
2)5b²-9-4b²-b+5=b²-b-4;
3)4x+2-x+1=3x+3;
4)3m²+m-1-m+3m²=6m²-1;
5)2a-3b-(-b)-a=2a-3b+b-a=a-2b;
6)a²+a+1-a²-a+1=2.