Решите уравнения

1) 3 (0.4 х+7) - 4 (0,8 х-3) = 2 2) 4,5 (7/15x+2/9) - 0,77 (8/11x-3/7) = - 1,75

1)

3 (0.4 х+7) - 4 (0,8 х-3) = 2

1,2x+21-3,2x+12=2

-2x+33=2

-2x=2-33

-2x=-31

x=31:2

x=15,5

2)

4,5 (7/15x+2/9) - 0,77 (8/11x-3/7) = - 1,75

2,1x + 1 - 0,56x + 0,33 = - 1,75

1,54x + 1,33 = - 1,75

1,54x = - 1,75 - 1,33

1,54x = - 3,08

x = - 3,08 : 1,54

x = - 2