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uang ari-> y
x+y=22.000
x+3y=42.000
x...?
y...?
x+y=22.000 |x3|3x+3y=66.000
x+3y=42.000|x1|x+3y=42.000
--------------------------------------------- -
2x=24.000
x=24.000:2
x=12.000
subtitusi-> x+y=22.000
12.000+y=22.000
y=22.000-12.000
y=10.000
jadi, uang aqil Rp12.000 dan uang Ari Rp10.000
selisih->12.000-10.000=2.000
jadi selisih uang aqil dan ari adalah Rp12.000