please explain how to smplify expression

1.  7.(6-3)=

2.  (9x7)-5=

3.  7.6-3=

4.  9x(7-5)=
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1 Answer

1) 7.(6-3)=7.3=7×3=21

2) (9×7)-5=63-5=58

3) 7.6-3=(7×6)-3=42-3=39

4) 9×(7-5)=9×2=18
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