5. Решите уравнение: 1) │х│=7; 2) │х│= –4; 3) │–х│=8,4.

[latex]|x|=7, \\ \left [ {{x=7,} \atop {-x=7;}} \right. \left [ {{x=7,} \atop {x=-7.}} \right. \\ \\ |x|=-4, \\ -4\ \textless \ 0, \ |x|\geq0, \\ x\in\varnothing. \\ \\ |-x|=8,4, \\ \left [ {{-x=8,4,} \atop {-(-x)=8,4;}} \right. \ \left [ {{x=-8,4,} \atop {x=8,4.}} \right.[/latex]