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z/7= v+ 5/7
x=7y+2
z=7v+5
z*x = (7y+2)(7v+5) = 49vy+35y+14v+10
(49vy+35y+14v+10) :7 = 7vy+5y+2v+1+ 3/7
Odp: Reszta to 3