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x + 2y = 19.500...(1)
4x + 4y = 50.000 (/4)
x + y = 12.500...(2)
x + 2y = 19500
x + y = 12500
---------------------- -
y = 7000
x = 12500 - 7000
= 5500
3x + 2y = 3(5500) + 2(7000)
= 16500 + 14000
= Rp30.500