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Mamy zatem do rozwiazania nastepujace rownania :
3m+2=2m-5 ; n-1=3n+7
3m-2m= -5-2 ; n-3n=7+1
m= -7 ; -2n=8/:(-2)
n= -4
-7 < -4
m < n
Prawdziwe jest B.