2001-197-х+51=2001
-197-х+51=0
-146-х=0
-х=146
х=-146
755+813-619+х=755
813-619+х=0
194+х=0
х=-194
1431-259-х-101=1431
-259-х-101=0
-х=360
х=-360
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2001-197-х+51=2001
-197-х+51=0
-146-х=0
-х=146
х=-146
755+813-619+х=755
813-619+х=0
194+х=0
х=-194
1431-259-х-101=1431
-259-х-101=0
-х=360
х=-360