Find the root of the equation:

Решение:

1. \( -y \cdot 4 = -120 \)
   \( -4y = -120 \)
   \( y = \frac{-120}{-4} \)
   \( y = 30 \)
2. \( -0.2x = 22 \)
   \( x = \frac{22}{-0.2} \)
   \( x = -110 \)
3. \( 2 \cdot (-t) = -28 \)
   \( -2t = -28 \)
   \( t = \frac{-28}{-2} \)
   \( t = 14 \)
4. \( \frac{1}{7}y = -8 \)
   \( y = -8 \cdot 7 \)
   \( y = -56 \)
5. \( \frac{2}{7}x = -\frac{10}{21} \)
   \( x = -\frac{10}{21} \cdot \frac{7}{2} \)
   \( x = -\frac{10}{2} \cdot \frac{1}{3} \)
   \( x = -5 \cdot \frac{1}{3} \)
   \( x = -\frac{5}{3} \)
6. \( -\frac{4}{9}x = \frac{16}{17} \)
   \( x = \frac{16}{17} \cdot \left(-\frac{9}{4}\right) \)
   \( x = \frac{4}{17} \cdot \left(-\frac{9}{1}\right) \)
   \( x = -\frac{36}{17} \)

Ответ: y = 30; x = -110; t = 14; y = -56; x = -\(\frac{5}{3}\); x = -\(\frac{36}{17}\)