0.2(x-5) + 2.5(8-x) = 21.3
0.2x - 1 + 20 - 2.5x = 21.3
-2.3x + 19 = 21.3
-2.3x = 2.3
x = 2.3 / (-2.3)
x = -1
Ответ: x = -1.
0.2(x-5) + 2.5(8-x) = 21.3
0.2x - 1 + 20 - 2.5x = 21.3
-2.3x + 19 = 21.3
-2.3x = 2.3
x = 2.3 / (-2.3)
x = -1
Ответ: x = -1.