2,3-1.6x=7/12 x + 5,9

2.3-1.6x=7:12x + 5.9

2.3-1.6x= $\frac{7}{12} x$ +5.9
-1.6x - $\frac{7}{12}$ x=5.9-2.3
-1.6x- $\frac{7}{12}$ x=3.6
- $\frac{16}{10}$ x - $\frac{7}{12}$ x=3.6
- $\frac{8}{5}$ x- $\frac{7}{12}$ x=3.6
$\frac{12*-8-5*7}{60} x$ =3.6
$\frac{-96-5*7}{60} }$ x=3.6
$\frac{-96-35}{60}$ x=3.6
$\frac{-131}{60}$ x=3.6
- $\frac{131}{60}$ x=3.6
x=3.6 : ( $- \frac{131}{60}$ )
x= $\frac{36}{10}$ : ( $-\frac{131}{60}$ )
x= $\frac{18}{5}$ : ( $- \frac{131}{60}$ )
x= $\frac{18}{5}$ * ( $-\frac{60}{131}$ )
x=18*( $- \frac{12}{131}$ )
x= $- \frac{18*12}{131}$
Ответ: x= $- \frac{216}{131}$

Надеюсь правильно.