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12 - 7 = 14 - 5 = 4 + 9 = 9 + 8 = 15 - 5 =
18 - 9 =       59 - 9 =         50 + 8 =      10 + 40 =      45 - 5 =   
30 + 5 =       75 - 30 =      57 - 40 =       10 + 9 =         20 + 5 =    
5+60= 19-9+3= 39-9+8= 15-8+2= 11-9+4=
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