Ответ:
750+х+250=1300
1000+х=1300
х=1300-1000
х=300
---------------
750+300+250=1300
1300=1300
(1400+в)-7000=8200
1400+в=8200+7000
1400+в=15.200
в=15.200 - 1400
а=13.800
_________
(1400+13.800)-7000=8200
15200-7000=8200
8200=8200
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Ответ:
750+х+250=1300
1000+х=1300
х=1300-1000
х=300
---------------
750+300+250=1300
1300=1300
(1400+в)-7000=8200
1400+в=8200+7000
1400+в=15.200
в=15.200 - 1400
а=13.800
_________
(1400+13.800)-7000=8200
15200-7000=8200
8200=8200