Đáp án+Giải thích các bước giải:
$a, 2x - 9 = -8-9$
$2x-9=-17$
$2x=-17+9$
$2x=-8$
$x=-8:2$
$x=-4$
$b, 35 - 5( x + 3 ) = |-15|$
$35-5(x+3)=15$
$5(x+3)=35-15$
$5(x+3)=20$
$x+3=20:5$
$x+3=4$
$x=4-3$
$x=1$
$c, -3 × | x - 1 | = - 27$
$|x-1|=-27:(-3)$
$|x-1|=9$
$<=>$\(\left[ \begin{array}{l}x-1=9\\x-1=-9\end{array} \right.\) $<=>$\(\left[ \begin{array}{l}x=9+1\\x=-9+1\end{array} \right.\) $<=>$\(\left[ \begin{array}{l}x=10\\x=-8\end{array} \right.\)
$\text{Vậy x∈{10;-8}}$
