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0 is the answer. when you add a 2 same number with opposite signs, the result is always 0
1 5 1
(x-1) + [(-x)-(-1)] is 0.

" -(x-1) or -1(x-1) is the opposite of (x-1) or 1(x-1)."

Let's say that "x-1" is 2.
"-(x-1)" will automatically be -2.

When added, the answer will be 0.

0 0 0
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