Ответ:

-7*(0,3x-8)=3*(0,4x+5)+8

-2,1х+56=1,2х+15+8

-2,1х-1,2х=15+8-56

-3,3х= -33

х= -33 : (-3,3)

х= 10

Ответ: х= 10

Пошаговое объяснение:

[tex] - 7 \times (0.3x - 8) = 3 \times (0.4x + 5) + 8 \\ - 2.1x + 56 = 3(0.4x + 5) + 8 \\ - 2.1x + 56 = 1.2x + 15 + 8 \\ - 2.1x + 56 = 1.2x + 23 \\ - 2.1x + 56 - 1.2x = 23 \\ - 3.3x + 56 = 23 \\ - 3.3x = 23 - 56 \\ - 3.3x = - 33 \\ x = - 33 \div ( - 3.3) \\ x = - 330 \div ( - 33) \\ x = 10[/tex]