Find the solution in the set W for each of the following:
a. 3 + (4 + 7) = (3 + x) + 7
b. 8 + 0 = x
c. 5 + 8 = 8 + x
d. x + 8 = 12 + 5
e. x + 8 = 5 + (x + 3)
f. x – 2 = 9
g. x – 3 = x + 1
h. 0 + x = x + 0
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