Ответ:

Решения уравнений:

  1. 1) -6(x + 2) = 4x - 17
    -6x - 12 = 4x - 17
    -12 + 17 = 4x + 6x
    5 = 10x
    x = 5 / 10
    x = 0,5
  2. 2) (18x - 19) - (4 - 7x) = -73
    18x - 19 - 4 + 7x = -73
    25x - 23 = -73
    25x = -73 + 23
    25x = -50
    x = -50 / 25
    x = -2
  3. 3) 10x + 3(7 - 2x) = 13 + 2x
    10x + 21 - 6x = 13 + 2x
    4x + 21 = 13 + 2x
    4x - 2x = 13 - 21
    2x = -8
    x = -8 / 2
    x = -4
  4. 4) -3(4 - 5y) + 2(3 - 6y) = -3,9
    -12 + 15y + 6 - 12y = -3,9
    (15y - 12y) + (-12 + 6) = -3,9
    3y - 6 = -3,9
    3y = -3,9 + 6
    3y = 2,1
    y = 2,1 / 3
    y = 0,7