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20*7*50=140*50=7000
150-43-67=107-67=40
80:2:5=40:5=8
b)22-6+4=16+4=20
10+2-4=12-4=8
12+15-3=27-3=24
75+15-10=90-10=80
c)12:4*6=3*6=18
12*5:4=60:4=15
20:10*100=2*100=200
300*10:5=3000:5=600