31,3 - x + 4,08 = 9,47
- x + 35,38 = 9,47
- x = - 35,38 + 9,47
- x = - 25,91
x = 25,91
31,3+x+4,08=9,47
31,3+x=9,47-4,08=5,39
x=5,39-31,3=-25,91
31,3+(-25,91)+4,08=9,47
9,47=9,47
ответ: x=-25,91
