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y=pasta gigi
3x+2y=12.600 3(1800)+2y=12.600
8x+3y=25.200 5400+2y = 12600
----------------------- --- 2y = 12.600 --- 5400
9x+6y=37800 2y = 7200
16x+6y=50.400 y= 3600
------------------------- -----
-7x=-12.600
x=1800
2x+y = 2(1800)+3600 = 7200