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

Okutoora kw'ekibaganizibwa: Toonyeza amapeesa ga rediyo g'empindura kulengesaniza, miga ipeesa ly'okutaahamu rundi lya hansi.
Ensoborra: (ebiroho) = embaganiza y'oruhindura orwongeraho, (eby'enyuma) = embaganiza y'oruhindura orurugaho, n = ekihingisibwa kike.