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jeruk: j
3m + 4j = 81000
2m + 6j = 104000
5m + 5j =....?
3m + 4j = 81000 | x 2
2m + 6j = 104000 | x 3
6m + 8j = 162000
6m + 18j = 312000
--------------------------- -
-10j= -156000
j=15600
3m+4j=81000
3m+4(15600)=810000
3m+62400=81000
3m=18600
m=6200
5m+5j= 5(15600)+5(6200)=78000+31000=109000