Ответ:
2) =
Ответ: x ∈ [1,5 ; 3]
4) = -5} \atop {x<12}} \right. = \left \{ {{x<1} \atop {x<12}} \right." alt="\left \{ {{-5x > -5} \atop {x<12}} \right. = \left \{ {{x<1} \atop {x<12}} \right." align="absmiddle" class="latex-formula">
Ответ: x ∈ [-∞ ; 1)
6) = 0} \atop {x\geq -7}} \right." alt="\left \{ {{x>0} \atop {x\geq -7}} \right." align="absmiddle" class="latex-formula">
Ответ: x ∈ (0 ; +∞)