`x-\frac{1}{2}=2\frac{2}{3}(3,25.\frac{4}{13}-1)`
`<=> x-\frac{1}{2}=2\frac{2}{3}(\frac{13}{4} . \frac{4}{3} -1)`
`<=> x-\frac{1}{2}=2\frac{2}{3}(1-1)`
`<=> x-\frac{1}{2}=2\frac{2}{3}.0`
`<=> x-\frac{1}{2}=0`
`<=> x = \frac{1}{2}`
`3\frac{1}{4}(x-\frac{2}{3})-(\frac{-1}{3}x-1\frac{2}{5})=-(\frac{-3}{4}-1)`
`<=> \frac{13}{4} (x-\frac{2}{3}) - (\frac{-1}{3}x-\frac{7}{5}) =-(\frac{-7}{4})`
`<=> \frac{13}{4}x-\frac{13}{6} +\frac{1}{3}x + \frac{7}{5} = \frac{7}{4}`
`<=> \frac{43}{12}x-\frac{23}{30}=\frac{7}{4}`
`<=> 215x-46=105`
`<=>215x=105+46`
`<=>215x=151`
`<=> x=\frac{151}{215}`