Ответ:

1)

  1. \(3x+7=0\); \(3x=-7\); \(x=-\frac{7}{3}\).
  2. \(13-100x=0\); \(100x=13\); \(x=0,13\).
  3. \(0,5x+0,15=0\); \(0,5x=-0,15\); \(x=-0,3\).
  4. \(8-0,8x=0\); \(0,8x=8\); \(x=10\).

2)

  1. \(7x-4=x-16\); \(6x=-12\); \(x=-2\).
  2. \(13-5x=8-2x\); \(5=3x\); \(x=\frac{5}{3}\).
  3. \(4y+15=6y+17\); \(-2y=2\); \(y=-1\).
  4. \(1,3p-11=0,8p+5\); \(0,5p=16\); \(p=32\).
  5. \(0,71x-13=-10-0,29x\); \(x=3\); \(x=3\).
  6. \(8c+0,73=6,1-8c\); \(16c=5,37\); \(c=0,335625\).

3)

  1. \(5x+3x-7=9\); \(8x=16\); \(x=2\).
  2. \(3y-5+y=11\); \(4y=16\); \(y=4\).
  3. \(48=11-9a-2\); \(48=9-9a\); \(-9a=39\); \(a=-\frac{13}{3}\).
  4. \(13-5x-11=6x\); \(2=11x\); \(x=\frac{2}{11}\).

4)

  1. \(7x+1-6x-3=5\); \(x-2=5\); \(x=7\).
  2. \(8x+11-13=9x-5\); \(8x-2=9x-5\); \(x=3\).
  3. \(2=3x-5-7+4x\); \(2=7x-12\); \(x=2\).
  4. \(8x+5=119+7-3x\); \(11x=121\); \(x=11\).