Ответ:

  1. \(3(2x-5)=6x-15\);
  2. \(-5(2{,}8x-1{,}2)=-14x+6\);
  3. \(0{,}2(7-4x)=1{,}4-0{,}8x\);
  4. \(-0{,}6(5+10x)=-3-6x\);
  5. \(10(0{,}12x-0{,}8)=1{,}2x-8\);
  6. \(\frac23(21x+1{,}5)=14x+1\).