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2x + 3y = 34500
4x + 3y = 46500
-------------------------- -
-2x = -12000
2x = 12000
x = 6000
masukkan x ke persamaan (2x + 3y = 34500)
2(6000) + 3y = 34500
12000 + 3y = 34500
3y = 34500 - 12000 = 22500
y = 7500
jika dijumlah => 6000 + 7500 = 13500