Odpowiedź:
[tex]a)\ \ a+(a-b)=a+a-b=2a-b\\\\b)\ \ 2x-(x+4)=2x-x-4=x-4\\\\c)\ \ 7-(-x+6)=7+x-6=x-1\\\\d)\ \ -(x+4)+(x-5)=-x-4+x-5=-9\\\\e)\ \ 1-(t+p)-(t-2)=1-t-p-t+2=3-2t-p\\\\f)\ \ -(-y+2)+(-2y-4)=y-2-2y-4=-y-6[/tex]
