Revision history of "2 − −7 = 9" (Z17118)

Icagura rya Diff: Shira akamenyetso kuri buto radio y'ivyasubiwemwo kugirango ugereranye hama ufyonde injira canke buto hepfo.
Legend: (muri kino gihe) = itandukano kumwe n'isubiramwo ryanyuma, (ubushize) = itandukano kumwe n'isubiramwo riheruka, t = ihinyanyura ritoya.