170+а=869
а=869-170
а=699
с-841=108
с=108+841
с=949
1)170+a=869
a=869-170
a=699
2)с-841=108
с=841+108
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170+а=869
а=869-170
а=699
с-841=108
с=108+841
с=949
1)170+a=869
a=869-170
a=699
2)с-841=108
с=841+108
с=949