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a fost răspuns

(x+3)-(×+3)=
(4x+6)-(4x-6)=
-(7x-3)+(3-7x)=
-(x la a doua +5x-1) (x la a doua+ 5x - 1)+5x=
7x-(3x-4x)+(x-1x)
-(3x+1)+(3x-1)