Помогите пожалуйста. мне очень нужно срочно, спасибо!

1)
|x - 2.3| - 4

x = 1.5
|x - 2.3| - 4 = |1.5 - 2.3| - 4 = |-0.8| - 4 = 0.8 - 4 = -3.2

2)
$|3x+1 \frac{4}{15} |+ \frac{2}{3} \\ \\ x=-1.2 = - \frac{6}{5} \\ |3x+1 \frac{4}{15} |+ \frac{2}{3}=| -\frac{3*6}{5} + \frac{19}{15} |+ \frac{2}{3}=| -\frac{18}{5} + \frac{19}{15} |+ \frac{2}{3}=| \frac{19-54}{15} |+ \frac{2}{3}= \\ = |-\frac{35}{15}| + \frac{2}{3}= \frac{7}{3} + \frac{2}{3}= \frac{9}{3} =3$

3)
$11+| \frac{3}{8}x- \frac{5}{6} | \\ \\ x=- \frac{4}{9} \\ \\ 11+| \frac{3}{8}x- \frac{5}{6} |=11+| -\frac{3*4}{8*9}- \frac{5}{6}| = 11 +| -\frac{1}{6} - \frac{5}{6} | = 11+|-1| = \\ =11+1=12$

4)
$\frac{8}{9} +| \frac{1}{12} x- \frac{7}{9} | \\ \\ x=-4 \\ \\ \frac{8}{9} +| \frac{1}{12} x- \frac{7}{9} |= \frac{8}{9} +|- \frac{4}{12} - \frac{7}{9} |= \frac{8}{9} +|- \frac{1}{3} - \frac{7}{9} |=\frac{8}{9} +|- \frac{3}{9} - \frac{7}{9} |= \\ \\ =\frac{8}{9} +|- \frac{10}{9} |=\frac{8}{9} + \frac{10}{9} =\frac{18}{9} =2$