12+8= 15-7= 25+30= 50-3= 46+9=
60-20= 14+6= 50-40= 16+8= 18+5=
0+100= 90-30= 27+9= 45-20= 36-5=
41+3= 63+8= 80-10= 58+3= 12+6-7=
86-6= 29-5= 80+9= 72-6= 37+10=
40+40= 48+4= 11-2= 23+60= 17-3-4=