a+(a-b)= 2x-(x+4)= 7-(-x+6)= -(x+4)+9x-5)= 1-(t+p)-(t-2)= -(-y+2)+(-2y-4)=

a+(a-b)=a+a-b=2a-b 2x-(x+4)=2x-x-4=x-4 7-(-x+6)=7+x-6=1+x -(x+4)+9x-5)=-x-4+9x-5=8x-9 1-(t+p)-(t-2)=1-t-p-t+2=3-2t-p -(-y+2)+(-2y-4)= y-2-2y-4=-y-6

a+ (a-b)= a+a-b = 2a +b 2x -(x+4)= 2x -x- 4= x-4 7-(-x+6) = 7+x -6= x+1 -(x+4) +9x-5- -x-4+9x-5= 8x-9 1-(t+p)-(t-2)= 1-t-p-t+2= 3-2t-p -(-y+2)+(-2y-4)= y-2-2y-4= -y-6