Ответ:

  1. \(0.5(x+4)-(5-3.6x)=0.5x+2-5+3.6x=4.1x-3\).
  2. \(-2(-0.2c+1)+3(-4c-4)=0.4c-2-12c-12=-11.6c-14\).
  3. \(3x(-1.2-c)-(8.7x+2)=-3.6x-3xc-8.7x-2=-12.3x-3xc-2\).
  4. \(-x(-6+c)-6x+xc=6x-xc-6x+xc=0\).