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2014-11-16T13:38:39+02:00
(2a+15):3=17 => 2a+15=17•3=51 => 2a=51-15=36 => a=36/2=18
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2014-11-16T13:39:41+02:00

A*2+15:3=17   A*2+15=17*3    A*2=36   A=18

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