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121*75-121*(-25)=121*(75-(-25)=121*(74+25)=121*100=12100
24*(-5)do 2- 48*(3+(-3)do 2)=
26*((-2)do 2 +9)-169*(-2do 2)=
6*55-5*66=6*5*11-5*11*6=0
23*3232-32*3232=3232(23-32)=3232*(-10)=-32320