-5(x-1.2) - 3(0.2-x) = 0.4(3-x)
-5x + 6 - 0.6 + 3x = 1.2 - 0.4x
-2x + 5.4 = 1.2 - 0.4x
-2x + 5.4 + 0.4x = 1.2
-1.6x + 5.4 = 1.2
-1.6x = 1.2 - 5.4
-1.6x = -4.2
x = -4.2 / -1.6
x = 2.625
Ответ: x = 2.625.
-5(x-1.2) - 3(0.2-x) = 0.4(3-x)
-5x + 6 - 0.6 + 3x = 1.2 - 0.4x
-2x + 5.4 = 1.2 - 0.4x
-2x + 5.4 + 0.4x = 1.2
-1.6x + 5.4 = 1.2
-1.6x = 1.2 - 5.4
-1.6x = -4.2
x = -4.2 / -1.6
x = 2.625
Ответ: x = 2.625.