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beras = y
5x = 26.400
x = 5.280
3y + x = 15.050
3y + 5.280 = 15.050
3y = 15.050 - 5.280
3y = 9.770
y = 3.256,7
2x + 2y =
2(5.280) + 2(3.256,7)=
10.560 + 6.513,4= 17.073,4