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42+8= 100-9= 6+74=
56-8= 72-30= 84+7=
75-7= 58-30= 95+5=
50+30= 50-40+6= 72+8-30=
20+(46-6)= 34-(60-40)= 35+(46-40)=
13+7= 16-9= 49-5= 48+9= 40+(15-8)=
77-7= 20+67= 18-8= 74-60= 93-(68-60)=
35+5= 60-40= 20+70= 17-8= 73-(13+7)=
48-30= 14-5= 64+30= 50-6= 56+5-20=
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