2a+1+a= 3a+1
4a-5a-3= -a-3-5a+7b+6a= a+7b 6b - 6a+2b= 8b-6a
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4a-5a-3=-3-1a
-5a+7b+6a=7b+a
6b - 6a+2b=8b-6a
2a+1+a= 3a+1
4a-5a-3= -a-3
-5a+7b+6a= a+7b
6b - 6a+2b= 8b-6a