-3<1+2x=<7 | -1<br>-4<2x≤6 |:2<br>-2///////////////////////
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---------o-------------o------> x
-2 3
Ответ: х∈(-2 ; 3]
2x+1
-7=< -------<2 |*2<br> 2
-14<2x+1<4 |-1<br>-15<2x<3 |:2<br>-7.5
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-----o---------o--------> x
-7.5 1.5
Ответ: х∈(-7,5 ; 1,5)