12+х=54
х=54-12
х=42
х+1000=20000
х=20000-1000
х=19000
123+х=457
х=457-123
х=334
х+1234=7896
х=7896-1234
х=6662
12+x=54
x=54-12
x=42
Пошаговое объяснение:
x+1000=20000
x=20000-1000
x=19000
123+x=457
x=457-123
x=334
x+1234=7896
x=7896-1234
x=6662
