$\text{a,}$ ${3+2(x-1)=-9}$
${2(x-1)=-9-3}$
${2(x-1)=-12}$
${x-1=-12 : 2}$
${x-1=-6}$
${x=-6+1}$
${x=-5}$
$\text{b,}$ ${|-2|x-2=-5}$
${-2.x - 2=}$ ${-5}$
${-2x =}$ ${-5+2}$
${-2x =-3}$
${x=-3:(-2)}$
${x=}$ $\frac{-3}{-2}$
${x=}$ $\frac{3}{2}$
$\text{Chúc bạn học tốt!!!!}$