Ответ:

2.1. \(20(x-22)=21\) \(x-22=\frac{21}{20}\), поэтому \(x=22+\frac{21}{20}=\frac{461}{20}\).

2.2. \(25(12x+30)=-12\) \(12x+30=-\frac{12}{25}\) \(12x=-\frac{762}{25}\), поэтому \(x=-\frac{127}{50}\).

2.3. \(-5(14x+22)=-12\) \(14x+22=\frac{12}{5}\) \(14x=-\frac{98}{5}\), поэтому \(x=-\frac{7}{5}\).

2.4. \(5(4x-4)=7\) \(4x-4=\frac{7}{5}\) \(4x=\frac{27}{5}\), поэтому \(x=\frac{27}{20}\).

Ответ: 2.1) \(\frac{461}{20}\); 2.2) \(-\frac{127}{50}\); 2.3) \(-\frac{7}{5}\); 2.4) \(\frac{27}{20}\).