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2m+3g=13600 (×1)
2m+2g=11200
2m+3g=13600
--------------------- -
-g=-2400
g=2400
m+g=5600
m+2400=5600
m=5600-2400=3200
2m+3g=13600
m+g=5600
pake cara eliminasi
2m+3g=13600 ------>2m+3g=13600
m+g=5600------------>2m+2g=11200
----------------------- -
g=2400
m+g=5600
m+2400=5600
m=5600-2400
m=3200
jadi harga 1 kg mentega adalah Rp3.200,00
semoga membantu :)