Вот карочи на рисунке
3.4x-15≤0.2x+4.2
3.4x-0.2x≤4.2+15
3.2x≤19.2
x≤6
15.4x-21.3<20.6x+15.1
15.4x-20.6x<15.1+21.3
-5.2x<36.4
x>>-7
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Вот карочи на рисунке
3.4x-15≤0.2x+4.2
3.4x-0.2x≤4.2+15
3.2x≤19.2
x≤6
15.4x-21.3<20.6x+15.1
15.4x-20.6x<15.1+21.3
-5.2x<36.4
x>>-7