Jawabanmu

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2014-09-11T16:12:57+07:00
2a-b-7=0 |x1  2a-b-7=0
a-3b-6=0 |x2  2a-6b-12=0

5b+5 =0
5b=-5
b=-1
a-3.-1-6=0
a-3=0
a=3


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