$\frac{3}{4}x + 0,24 = \frac{2}{7}x - 1,06$
$\frac{3}{4}x - \frac{2}{7}x = -0,24 - 1,06$
$\frac{21}{28}x - \frac{8}{28}x = -1,3$
$\frac{13}{28}x = -\frac{13}{10}$
$x = -\frac{13}{10} : \frac{13}{28}$
$x = -\frac{13}{10} * \frac{28}{13}$
$x = -\frac{1}{10} * \frac{28}{1}$
x = −2,8

$\frac{2}{11}x + \frac{5}{14} = 0,45x + 1,2$
$\frac{2}{11}x - \frac{9}{20}x = \frac{6}{5} - \frac{5}{14}$
$\frac{40}{220}x - \frac{99}{220}x = \frac{84}{70} - \frac{25}{70}$
$-\frac{59}{220}x = \frac{59}{70}$
$x = \frac{59}{70} : (-\frac{59}{220})$
$x = \frac{59}{70} * (-\frac{220}{59})$
$x = \frac{1}{7} * (-\frac{22}{1})$
$x = -3\frac{1}{7}$

$\frac{2}{35} - 2,9x = 0,8x - \frac{3}{14}$
$-2,9x - 0,8x = -\frac{3}{14} - \frac{2}{35}$
$-3,7x = -\frac{15}{70} - \frac{4}{70}$
$-\frac{37}{10}x = -\frac{19}{70}$
$x = \frac{19}{70} : \frac{37}{10}$
$x = \frac{19}{70} * \frac{10}{37}$
$x = \frac{19}{7} * \frac{1}{37}$
$x = \frac{19}{259}$

$-0,21x - \frac{15}{56} = \frac{3}{16} + \frac{257}{800}x$
$-\frac{21}{100}x - \frac{257}{800}x = \frac{3}{16} + \frac{15}{56}$
$-\frac{168}{800}x - \frac{257}{800}x = \frac{21}{112} + \frac{30}{112}$
$-\frac{425}{800}x = \frac{51}{112}$
$x = \frac{51}{112} : (-\frac{17}{32})$
$x = \frac{51}{112} * (-\frac{32}{17})$
$x = \frac{3}{7} * (-\frac{2}{1})$
$x = -\frac{6}{7}$