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2a+4=b+1
2a-b=1-4
2a-b=-3
(a+1)/(b-2)=3/5
5a+5=3b-6
5a-3b=-6-5
5a-3b=-11
2a-b=-3 |×3| 6a-3b=-9
5a-3b=-11 |×1| 5a-3b=-11
--------------(-)
a=2
2.2-b=-3
-b=-3-4
b=7
pecahan itu adalah 2/7