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2x+y=14.000
x+2y=13000
--->2x+y=14000
--->2x+4y=26000
________________-
-3y=-12000
y=4000
2x+y=14000
2x=14000-4000
x=5000
8.5000+a.4000=80000
40000+a.4000=80000
a.4000=40000
a=40000:4000
a=10
jadi 10 mangkuk es campur