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a + b = b + a ... (tak dapat diselesaikan)
2 - a = 2a + 8
- a - 2a = 8 - 2
- 3a = 6
a = 6/-3
a = - 2
5 - c = - 5 + c
- c - c = - 5 - 5
- 2c = - 10
c = - 10/ -2
c = 5
a + b + c = - 2 + b + 5
= 3 + b