Question

решите уравнение пожалуйста

Answer 1

8(0.7x-4)-2(0.2x-3)=-39
5.6x-32-0.4x+6=-39
5.6x-04x=-39+32-6
5.2x=-13
x=-13:5.2
x=-2.5

Answer 2

$8 \times (0.7x - 4) - 2 \times (0.2x - 3) = - 39 \\ 5.6x - 32 - 0.4x + 6 = - 39 \\ 5.2x - 26 = - 39 \\ 5.2x = - 39 + 26 \\ 5.2x = - 13 \\ x = - 2.5$