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