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3x+2y=31
2(2x+y=18)
-1(3x+2y=31)
4x+2y=36
-3x-2y=-31
x=5
2x+y=18
2(5)+y=18
10+y=18
y=18-10
y=8
Precio del refresco = 5
Precio de las papas =8