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3c+2b=130.000 dikali 1 3c+2b=130.000
Di eleminasi
7b=140.000
b=20.000
1c+3b=90.000
1c+60.000=90.000
c=30.000
c+b=20.000+30.000=50.000
Jadi jawabanya Rp. 50.000
Semoga Bermanfaat :-)