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2014-03-18T20:26:40+02:00
( \frac{2}{10}- \frac{4}{5} )* \frac{2}{3} = ( \frac{1}{5}- \frac{4}{5}) * \frac{2}{3} =  -\frac{5}{5} *  \frac{2}{3}=  \frac{10}{15} =  \frac{2}{3}   


4*(x-3)=16 | :4
    x-3 = 4  |+3
       x=7
1 5 1