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2 x + 5 y = 28200 ×3
dieliminasi x
6 x + 8 y = 55200
6 x + 15y = 84600
= -7y= -29400
y= 4200
3x + 4(4200) =27600
3x + 16800 = 27600
3x=27600-16800
3x=10800
x=3600
6(3600)+1(4200)=..
21600+4200=25800