$|x|< 3$
$⇒$ $|x|$ $∈$ `{0;1;2}`
$⇔$ $x$ $∈$ `{0;±1;±2}`
Vậy $x$ $∈$ `{0;±1;±2}`
$(x-3)(x-5) < 0$
$⇒$ $x-3;x-5$ khác dấu
$TH1$. $\left \{ {{x-3 > 0 } \atop {x- 5 <0}} \right.$ $⇔$ $3 < x < 5$ ($TM$)
$TH1$. $\left \{ {{x-3 < 0 } \atop {x- 5 > 0}} \right.$$⇒$ $KTM$
Vậy $3 < x < 5$
$2.x.2-3=29$
$⇔ 4x - 3 = 29$
$⇔ 4x = 32$
$⇔ x = 8$
Vậy $x=8$
$-6.x-(-7)=25$
$⇔ -6x + 7 = 25$
$⇔ -6x = 18$
$⇔ x = -3$
Vậy $x=-3$
$46-(x-11)=-48$
$⇔ x-11 = -94$
$⇔ x = 105$
Vậy $x=105$
