Answer:
x = 4 1/2
Explanation:
To get to minus 1/2 from plus 2 you would subtract 2 1/2 from 2.
To arrive at x you would add 2 1/2 to 2.
The result is a progression of: 4 1/2, 2, - 1/2
(4 1/2 minus 2 1/2 = 2; 2 minus 2 1/2 = - 1/2)
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