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raspunsul la inecuatia 9(5-x)<12(x+1)+19

Răspuns :

9(5-x)<12(x+1)+19
45-9x<12x+12+19
45-9x<12x+31
45-31<12x+9x
14<21 x
x > 14/21
x > 2/3
x∈R⇒S:x∈(2/3,∞)
45-9x<12x+12+19
45-9x<12x+31
-9x-12x<31-45
-21x<-14|·(-)
21x>14
x>14 supra 21(simplifici cu 7)
x>2 supea 3