Ответ:

  1. а) 3x − x = 6 + 8; 2x = 14; x = 7.
  2. б) 7a + 4a = 2 + 10; 11a = 12; a = 12/11.
  3. в) (1/6 + 1/2)y = 3 + 1/2; (2/3)y = 7/2; y = 21/4.
  4. г) 0,3b = 1,5; b = 5.
  5. д) p/2 = 5/8; p = 5/4.
  6. е) −2y = 2,4; y = −1,2.
  7. ж) x = (1/2) ÷ (2/7) = 7/4.
  8. з) 1,3x = 0; x = 0.