20+30=
87-40=
92+7=
30+45-50=
50-30=
50-6=
60+26=
20+(33-5)=
17-9=
6+75=
46-5=
37-6+8=
0+38=
20-7=
16+50=
87-(20+30)=
90-50=
17-6=
28-5=
20+30-40=
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