1) m-(m-b)=m-m-b=-b
2) a+(-a+7)=a-a+7=7
3) (b+3) -(b+9) =b+3-b+9=12
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1) m-(m-b)=m-m-b=-b
2) a+(-a+7)=a-a+7=7
3) (b+3) -(b+9) =b+3-b+9=12