3189 – a = 1068 + 129
– a = 129 + 1068 – 3189
-a = -1992
a = 1992
6657 + x = 7075 + 1001
x = 1001 + 7075 – 6657
x = 1419
3189 – a = 1068 + 129
– a = 129 + 1068 – 3189
-a = -1992
a = 1992
6657 + x = 7075 + 1001
x = 1001 + 7075 – 6657
x = 1419