-(a-b+c)+(a-b+d) (a+b)-(-a+b-c) -(a+b)+(a+b+c)

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1. -(a-b+c)+(a-b+d)

   =-a+b-c+a-b+d

   =d-c

   (a+b)-(-a+b-c)

   =a+b+a-b+c

   =a+2c

   -(a+b)+(a+b+c)

   =-a-b+a+b+c

   =c

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2. -(a-b+c)+(a-b+d) = -a + b – c + a – b + d = d – c

   (a+b)-(-a+b-c) = a + b + a -b + c = a + 2c 

   -(a+b)+(a+b+c) = -a -b + a + b + c = c

    

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