Хелп 0.6: (-x) = 2/5:6/7; - 2 * (3x-1.5) = - 1; - 6.4: (-4-x) = - 0.8 это уравнения

1) 0.6: (-x) = 2/5:6/7

0.6: (-х) = 2/5:6/7

x ≠0

0.6*6/7=2/5 * (-x)

3/5*6/7=-2/5x

18/25=-2/5x

-9/7=x

x=-9/7

x≠0

x=-9/7 или - 1 2/7 или - 1,28

2) - 2 * (3x-1.5) = - 1

-6 х+3=-1

-6 х=-1-3

-6 х=-4

х=2/3 или ≈0,66

3) - 6.4: (-4-x) = - 0.8

-6,4: (-4-х) = - 0,8

х ≠-4

-32/5*1/-4-x=-0.8

-32/5 (-4-x) = - 0.8

32=4 (-4-x)

8=-4-x

x=-4-8

x=-12 - ответ

x≠-4