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a. 11 + (x + y) = 11 + x + y

    11 + x + y =  11 + x + y  

b.7 - (2x - 3y) = 7 - 2x + 3y

   7 - 2 x + 3 y =  7 - 2 x + 3 y

c. 2(x + 4) = 2x + 4

   2 x + 8  ≠  2 x + 4

d.5+ 7x = 12x

   5 + 7 x  ≠ 12 x

e. -5(x + 9) = -5x – 45​

   - 5 x - 45 = - 5 x - 45

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