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2014-01-22T10:22:49+02:00
X/12=2/3⇒x=2*12/3⇒x=8
18/x=2/3⇒x=3*18/2⇒x=27
10/5x=2/3⇒10x=30⇒x=3
7x/21=2/3⇒7x=14⇒x=2
2 5 2