6237 + 243 – a = 1240
– a = 1240 – 243 – 6237
-a = -5240
a = 5240
6237 + 243 – a = 1240 – a = 1240 – 243 – 6237 -a = -5240 a = 5240
6237 + 243 – a = 1240
– a = 1240 – 243 – 6237
-a = -5240
a = 5240
6237 + 243 – a = 1240 – a = 1240 – 243 – 6237 -a = -5240 a = 5240