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b) (1+x)+(-7)=-12-x c)3x-1=-1

Răspuns :

B) (1+x)+(-7)=-12-x 
=> 1+x-7=-12-x
=> x-6=-12-x
=> 2x-6=-12
=>2x=-2
=>x=-1
C)
3x-1=-1
=> 3x=0
=>x=0