The fragment WORD_CANCEL_ss helps simplify linear equations over bit-vectors.
This fragment is designed to work in concert with wordsLib.WORD_ARITH_ss. The
procedure will endeavour to ensure that all coefficients appear in positive
form. Furthermore, the leftmost coefficient will be highest on the left-hand
side of equations.
> SIMP_CONV (pure_ss++wordsLib.WORD_ARITH_ss++wordsLib.WORD_CANCEL_ss) 
``-3w * b + a = -2w * a + b: word32``;
val it =
|- (-3w * b + a = -2w * a + b) <=> (4w * b = 3w * a):
This fragment can be viewed as a superior version of wordsLib.WORD_ARITH_EQ_ss.