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a fost răspuns

(x+3)-(x+3)=
(4x+6)-(4x-6)=
-(3x+1)+(3x-1)=
-(7x-3)+(3-7x)=

Răspuns :

CosmoteRo
(x+3)-(x+3)=x+3-x-3=0
(4x+6)-(4x-6)=4x+6-4x+6=0
-(3x+1)+(3x-1)=-3x-1+3x-1=-2
-(7x-3)+(3-7x)=-7x+3+3-7x=-14x+6