6.7 - x = 3.9-x = 3.9 - 6.7-x = -2.8x = 2.8
x + 6.9 = 7.2x = 7.2 - 6.9x = 0.3
(x - 5.4) + 2.3 = 5.2x - 5.4 + 2.3 = 5.2x - 3.1 = 5.2x = 5.2 + 3.1x = 8.3
(9.1 - x) - 2.8 = 2.99.1 - x - 2.8 = 2.99.1 - x = 2.9 + 2.89.1 - x = 5.7-x = 5.7 - 9.1-x = -3.4x = 3.4
Ответ: x = 2.8, x = 0.3, x = 8.3, x = 3.4
6.7 - x = 3.9
-x = 3.9 - 6.7
-x = -2.8
x = 2.8
x + 6.9 = 7.2
x = 7.2 - 6.9
x = 0.3
(x - 5.4) + 2.3 = 5.2
x - 5.4 + 2.3 = 5.2
x - 3.1 = 5.2
x = 5.2 + 3.1
x = 8.3
(9.1 - x) - 2.8 = 2.9
9.1 - x - 2.8 = 2.9
9.1 - x = 2.9 + 2.8
9.1 - x = 5.7
-x = 5.7 - 9.1
-x = -3.4
x = 3.4
Ответ: x = 2.8, x = 0.3, x = 8.3, x = 3.4