1703+x=1213+490, x+1547= 1970+749
1703+х=1703 х+1547=2719
х=1703 -1703 х= 2719 - 1547
х=0 х=1172
1703+x=1213+490
1703+х=1703
х=1703-1703
х=0
_____________________________
1703+0=1703
x+1547= 1970+749
x+1547=2719
х=2719-1547
х=1172
__________________________
1172+1547= 2719
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1703+х=1703 х+1547=2719
х=1703 -1703 х= 2719 - 1547
х=0 х=1172
1703+x=1213+490
1703+х=1703
х=1703-1703
х=0
_____________________________
1703+0=1703
x+1547= 1970+749
x+1547=2719
х=2719-1547
х=1172
__________________________
1172+1547= 2719