ถูกต้อง: 5+2=7, 14X+2=8, 32-2=30, 45-40=5, 54-56=-2, 54y-14y=40y, 32-0=32, 65m+14m=79m, 54n=7n, ุ124+12=65, ไม่ถูกต้อง: 45-5>30, 50x+12x<45x, 80+12>14, 65+12<65+15, 45>54, 65<89+12, 32-10<35, 56>12, 32b+12b<32, 87-12<87, 321-65<576, 87-9<43, 54m-67m<43m, 87<45, 65k-87k<56k,

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