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2c+5g=1500
2(1150-2g/3+5g=1500
2(1150-2g)+15g=1500*3
2300-4g+15g=4500
11g=4500-2300
g=2200/11
g=200 (valor galletas)
3c+2g=1150
3c+400=1150
c=1150-400/3
c=750/3
c=250 (valor chicles)