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2. =7+4=11
3. =9-2*2=9-4=5
4.= 5+8*2=5+16=21
2.13-6+4=7+4=11
3.9-8:4*2=9-2*2=9-4=5
4.5+8*(9-7)=5+8*2=5+16=21