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-3s= r-p / odustronnie dziele przez (-3)
s=(p-r)/3
-3s = r-p /x(-1)
3s = -r+p
3s = p-r /:3
s = (p-r)/3
-3s = r/p / + 3
s = r/p + 3
/-podzielic obustronnie lub w ulamku