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2014-11-11T15:54:57+02:00
4851-x-2x-3x=51
4851-6x=51
4851-51=6x
4800=6x
x=800
2 5 2
2014-11-11T15:56:47+02:00
4851 - x - 2x - 3x = 51 
4851 - 6x = 51 
6x = 4800
x = 4800 : 6 
x = 800
1 5 1