14-6= 15-9= 11-8= 13-7=
12-4= 5+6= 7+7= 15-6=
29+0= 36-20= 57-40= 6+12=
81-30= 72-2= 20+28= 33+5=
49-8= 24+40= 85-60= 59-5=
37-7= 96-60= 43-1 = 30+30=
21+7= 61+5= 61-10= 25+4=
30+60-40= 60+40-20= 80-50+4=
53-3-30= 90-40-20- 30+70-40=
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