Ответ:

  1. \(7x+3=30-2x\), \(9x=27\), \(x=3\).
  2. \(3(x-2)=x+2\), \(3x-6=x+2\), \(2x=8\), \(x=4\).
  3. \(1-2(5+3x)=15\), \(-9-6x=15\), \(-6x=24\), \(x=-4\).
  4. \(-4x=15-3(3x-5)\), \(-4x=30-9x\), \(5x=30\), \(x=6\).
  5. \((7x+3)-(9x+7)=5\), \(-2x-4=5\), \(-2x=9\), \(x=-\frac{9}{2}\).
  6. \(5-2(x-1)=4-x\), \(7-2x=4-x\), \(x=3\).