3 = 5+x-1
4 = 5 + x
-1 = x
x = -1
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It equals 1
When you are using non-standard definitions of "plus" and "minus", or of "equal".
As stated in the question, it equals 1.
No. But sin2a equals 1 minus cos2a ... and ... cos2a equals 1 minus sin2a
4