Răspunsuri

  • Utilizator Brainly
2014-03-29T15:11:46+02:00
A) 7x-3=5x+21 ⇒ 7x-5x=21+3 ⇒ 2x=24, x=12
b) 12x-5≥7x+30 ⇒ 12x-7x≥30+5 ⇒ 5x≥35, x≥7
2014-03-29T15:14:48+02:00
7x-3=5x+21
7x-5x=21+3
2x=24
x=24/2
x=12
 12x-5 ≥ 7X +30 
12x-7x 
≥30+ 5
5x 
≥ 35 
≥ 35/5 
≥ 7