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2014-04-15T18:58:02+02:00
2x+4y=65
-6x=32y=37


45x-12y=35
28x-27y=45

-7x+4y+45=124
13x+15y=82


46x+31y=68
76x+79y+23=234


54x-24y-8=56
-7x+32y-46=145