a)a+(a-b)=a+a-b=2a-b b)2x - (x + 4)=2x-x-4=x-4 c)7 - (-z + 6)=7+z-6=1+z 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
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a)a+(a-b)=a+a-b=2a-b
b)2x - (x + 4)=2x-x-4=x-4
c)7 - (-z + 6)=7+z-6=1+z
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