х + 19 = 12
х = 12 - 19
х = - 7
- 7 + 19 = 12
- 25 - х = - 17
х = - 25 - (- 17)
х = - 25 + 17
х = - 8
- 25 - (-8) = - 25 + 8 = - 17
1)
x+19=12
x=12-19
x=-7
2)-25-x=-17
x= -25+17
x=-8
х + 19 = 12
х = 12 - 19
х = - 7
- 7 + 19 = 12
- 25 - х = - 17
х = - 25 - (- 17)
х = - 25 + 17
х = - 8
- 25 - (-8) = - 25 + 8 = - 17
1)
x+19=12
x=12-19
x=-7
2)-25-x=-17
x= -25+17
x=-8