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Rezolvati in R inecuatia: 2(1-x)≥4(3x+2)

Răspuns :

2-2x≥12x+8
-2x-12x≥8-2
-14x≥6       inmultim -1
14x≤-6
x≤-6/14      simplif 2
x≤-3/7
x∈(-α,-3/7]
2(1-x)≥4(3x+2)⇒
2-2x≥12x+8⇒
-2x-12x≥-2+8⇒
-14x≥-6⇒
x=-6/-14⇒x=-3/7
succes