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2. 1/3+13/5=5/15+13/15=18/15=1 3/15=1 1/5
3. 9/5+3/5+5/3=27/15+9/15+25/15=61/15=4 1/15
4. =5:2000000=1:400000
5. budi: anton =7:2
7+2=54.000
9=54.000
1=54.000/9=6000
anton=2=2×6000=12000
6. n=(-2,5)