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5a=2b (i)
b-a=7
b=a+7 (ii)
subtitusikan pers. (ii) ke (i)
5a=2(a+7)
5a=2a+14
5a-2a=14
3a=14
a=14/3
b=a+7
b=14/3 + 7
b= 35/3