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bilangan 2 = 17
a - b = 10 -----> a - b = 10
2a = b - 3 -----> 2a - b = - 3
- a = 13 ----> a = - 13
a - b = 10
- 13 - b = 10
b = - 23
jadi bil I = - 13
bil II= - 23