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2.misal ayam=x
kambing=y
x+y=50
2x+4y=136
-------------------- -
2x+2y=100
2x+4y=136
_________ _
-2y=-36
y=18
jadi kambing=18
x+y=50
x+18=50
x=50-18
=32
jadi kambing=32 ekor
Maaf,yang a masih bingung^_^