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Rezolvați ecuatia, x aparține R: |x+2| - 11 = - 2|x+2| +4

Răspuns :

(x+2)-11=-2(x+2)+4
x+2=-2x-4+4+11
2x+4+x+2=15
3x+6=15
3x=15/6
x=15/6 :3
x=15/6x1/3
x=15/18
x=5/6
|x+2| - 11 = - 2|x+2| +4
(Il muți - 2×|x+2| si -11 in cealalta parte)
|x+2|+2×|x+2|=4+11
3×|x+2|=15
|x+2|=15:3
|x+2|=5
x+2=5______x+2=-5
x=3________x=-7