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2014-11-05T23:19:49+02:00
X-nr rational2x/5+30/100·2x/5=x-1/5
2x/5+3x/25=x-1/5
(10x+3x)/25=x-1/5
13x/25-x=-1/5
(13x-25x)/25=-1/5
-12x/25=-1/5     (-1)
12x·5=25
x=25/12·5=5/12
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