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b) a-6+a
c)2a
d)x-1
b) -(-a)+(-6+a)=a-6+a=2a-6
c) a-∑b-(a+b)∑=a-(b-a-b)=a-b+a+b=2a
d) x-∫x-∑x-(x+1)-(x-1) -x ∑ + (1-x∫=x-{x-(x-x-1-x-1)+1-x)=
=x-(x-x+x+1+x+1)+1-x=x-x+x-x-1-x-1+1-x=-1-2x