$\frac{-21}{15}$x + $\frac{1}{3}$ = $\frac{-2}{5}$
⇒$\frac{-21}{15}$x =$\frac{-2}{5}$ - $\frac{1}{3}$ = $\frac{-11}{15}$
⇒ x= $\frac{-11}{15}$ : $\frac{-21}{15}$ = $\frac{-11}{15}$ . $\frac{15}{-21}$ = $\frac{11}{21}$
$\frac{15}{7}$ : x - $\frac{2}{5}$ = $\frac{1}{5}$
⇒ $\frac{15}{7}$ : x = $\frac{1}{5}$ + $\frac{2}{5}$ = $\frac{3}{5}$
⇒ x= $\frac{15}{7}$ : $\frac{3}{5}$ = $\frac{15}{7}$ . $\frac{5}{3}$ = $\frac{25}{7}$
|x-1,5| = 2
⇒ x-1,5 ∈{2;-2}
⇒$\left \{ {{x - 1,5= 2} \atop {x - 1,5= -2}} \right.$
⇒$\left \{ {{x=2+1,5=3,5} \atop {x= -2+1,5=-0,5}} \right.$
⇒ x ∈ {3,5; -0,5}
