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2010-01-10T17:28:24+01:00
2x-11y=73 /*(-3)
3x-4y=47 /*2

-6x+33y=-219
6x-8y=94
---------------
25y=-125 /:25
y=-5

3x=47+4y
3x=47+4(-5)=47-20=27 /:3
x=9

x=9
y=-5

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