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Rezolva ecuațiile : a) 4x - (1+3x) = -9 b) 11-3 (x-2 )=14 c) x radical 2 = 12

Răspuns :

4x-1-3x=-9
x=-9+1
x=-8

b) 11-3x+6=14
17-3x=14
17-14=3x
3=3x
x=1