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(x+32)-(x+64)=
x+(-x+y)=
-(m-47+n)-(103-m)=
-(a-b)-b=
-(27-a)+(-a+18)=
-(-62+a+b)-(a-b+109)=
-c+(c-d)=
(x+32)-(x+64)=
x+(-x+y)=
-(m-47+n)-(103-m)=
-(a-b)-b=
-(27-a)+(-a+18)=
-(-62+a+b)-(a-b+109)=
-c+(c-d)=
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