11-7 = 5+34 = 17+70 = 25-6 = 87-40=
4+36 = 40-3 = 30+64 = 65-8 = 36+40=
71 - 6= 31+8 = 5+37 = 64-40= 5+47=
12-7+8= 17-9-5= 50+33-6= 54-50+19= 7+43-10=