1. ...=а-2+а-3+2а-7=4а-12=4(а-3);
2. ...=2а-6-5а-6=-3а-6-6=-3а-12;
3. ...=-6х+27-5х+1=-11x+28;
4. ...=x-3+x-5-7+3x=5x-15=5(x-3);
5. ...=-2m+6-3m+5=-5m+6+5=-5m+11;
6. ...=8a-4+7-5a=3a-4+7=3a+3.
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Answers & Comments
1. ...=а-2+а-3+2а-7=4а-12=4(а-3);
2. ...=2а-6-5а-6=-3а-6-6=-3а-12;
3. ...=-6х+27-5х+1=-11x+28;
4. ...=x-3+x-5-7+3x=5x-15=5(x-3);
5. ...=-2m+6-3m+5=-5m+6+5=-5m+11;
6. ...=8a-4+7-5a=3a-4+7=3a+3.