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4x-{2x-1-[5-(3x-1)+2x+1]}=0

Răspuns :

4x-{2x-1-[5-3x+1+2x+1]}=0
4x-[2x-1-(7-x)]=0
4x-(2x-1-7+x)=0
4x-2x+1+7-x=0
X+8=0
X=-8