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2014-11-11T16:48:49+02:00
5+4x+2=5x-5
12=9x
x=9/12=3/4
2014-11-11T16:55:52+02:00
5+2·2x+2·1=5x-5·1 5+4x+2=5x-5|-4x 5+2=x-5|+5 5+2+5=x X=12
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